cloudwatch: ISO-friendly tagging

[YakDriver]

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Relates #18593
Relates #22532

Output from acceptance testing (us-west-2):

% make testacc TESTS=TestAccCloudWatchCompositeAlarm_ PKG=cloudwatch
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/cloudwatch/... -v -count 1 -parallel 20 -run='TestAccCloudWatchCompositeAlarm_'  -timeout 180m
--- PASS: TestAccCloudWatchCompositeAlarm_disappears (20.04s)
--- PASS: TestAccCloudWatchCompositeAlarm_basic (23.79s)
--- PASS: TestAccCloudWatchCompositeAlarm_updateAlarmRule (39.98s)
--- PASS: TestAccCloudWatchCompositeAlarm_description (40.27s)
--- PASS: TestAccCloudWatchCompositeAlarm_actionsEnabled (40.38s)
--- PASS: TestAccCloudWatchCompositeAlarm_allActions (42.97s)
--- PASS: TestAccCloudWatchCompositeAlarm_okActions (57.93s)
--- PASS: TestAccCloudWatchCompositeAlarm_alarmActions (58.02s)
--- PASS: TestAccCloudWatchCompositeAlarm_insufficientDataActions (58.10s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/cloudwatch	59.533s
% make testacc TESTS=TestAccCloudWatchMetricAlarm_ PKG=cloudwatch
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/cloudwatch/... -v -count 1 -parallel 20 -run='TestAccCloudWatchMetricAlarm_'  -timeout 180m
--- PASS: TestAccCloudWatchMetricAlarm_missingStatistic (8.44s)
--- PASS: TestAccCloudWatchMetricAlarm_disappears (18.27s)
--- PASS: TestAccCloudWatchMetricAlarm_dataPointsToAlarm (20.92s)
--- PASS: TestAccCloudWatchMetricAlarm_extendedStatistic (20.95s)
--- PASS: TestAccCloudWatchMetricAlarm_basic (23.15s)
--- PASS: TestAccCloudWatchMetricAlarm_AlarmActions_swfAction (23.76s)
--- PASS: TestAccCloudWatchMetricAlarm_AlarmActions_snsTopic (26.04s)
--- PASS: TestAccCloudWatchMetricAlarm_evaluateLowSampleCountPercentiles (32.17s)
--- PASS: TestAccCloudWatchMetricAlarm_treatMissingData (43.94s)
--- PASS: TestAccCloudWatchMetricAlarm_tags (46.23s)
--- PASS: TestAccCloudWatchMetricAlarm_expression (79.77s)
--- PASS: TestAccCloudWatchMetricAlarm_AlarmActions_ec2Automate (226.88s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/cloudwatch	228.299s
% make testacc TESTS=TestAccCloudWatchMetricStream_ PKG=cloudwatch
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/cloudwatch/... -v -count 1 -parallel 20 -run='TestAccCloudWatchMetricStream_'  -timeout 180m
--- PASS: TestAccCloudWatchMetricStream_noName (19.99s)
--- PASS: TestAccCloudWatchMetricStream_excludeFilters (20.31s)
--- PASS: TestAccCloudWatchMetricStream_includeFilters (20.34s)
--- PASS: TestAccCloudWatchMetricStream_namePrefix (20.42s)
--- PASS: TestAccCloudWatchMetricStream_tags (20.42s)
--- PASS: TestAccCloudWatchMetricStream_basic (137.60s)
--- PASS: TestAccCloudWatchMetricStream_update (150.95s)
--- PASS: TestAccCloudWatchMetricStream_updateName (261.16s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/cloudwatch	262.424s

Output from acceptance testing (GovCloud):

% make testacc TESTS=TestAccCloudWatchCompositeAlarm_ PKG=cloudwatch
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/cloudwatch/... -v -count 1 -parallel 20 -run='TestAccCloudWatchCompositeAlarm_'  -timeout 180m
--- PASS: TestAccCloudWatchCompositeAlarm_disappears (28.98s)
--- PASS: TestAccCloudWatchCompositeAlarm_basic (30.33s)
--- PASS: TestAccCloudWatchCompositeAlarm_description (56.80s)
--- PASS: TestAccCloudWatchCompositeAlarm_allActions (57.21s)
--- PASS: TestAccCloudWatchCompositeAlarm_actionsEnabled (57.42s)
--- PASS: TestAccCloudWatchCompositeAlarm_updateAlarmRule (57.48s)
--- PASS: TestAccCloudWatchCompositeAlarm_okActions (77.59s)
--- PASS: TestAccCloudWatchCompositeAlarm_alarmActions (77.81s)
--- PASS: TestAccCloudWatchCompositeAlarm_insufficientDataActions (77.88s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/cloudwatch	79.566s
% make testacc TESTS=TestAccCloudWatchMetricAlarm_ PKG=cloudwatch
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/cloudwatch/... -v -count 1 -parallel 20 -run='TestAccCloudWatchMetricAlarm_'  -timeout 180m
--- PASS: TestAccCloudWatchMetricAlarm_missingStatistic (9.19s)
--- PASS: TestAccCloudWatchMetricAlarm_disappears (19.08s)
--- PASS: TestAccCloudWatchMetricAlarm_extendedStatistic (22.76s)
--- PASS: TestAccCloudWatchMetricAlarm_dataPointsToAlarm (22.78s)
--- PASS: TestAccCloudWatchMetricAlarm_basic (25.79s)
--- PASS: TestAccCloudWatchMetricAlarm_AlarmActions_swfAction (25.86s)
--- PASS: TestAccCloudWatchMetricAlarm_AlarmActions_snsTopic (29.38s)
--- PASS: TestAccCloudWatchMetricAlarm_evaluateLowSampleCountPercentiles (41.41s)
--- PASS: TestAccCloudWatchMetricAlarm_tags (57.46s)
--- PASS: TestAccCloudWatchMetricAlarm_treatMissingData (58.90s)
--- PASS: TestAccCloudWatchMetricAlarm_expression (104.35s)
--- PASS: TestAccCloudWatchMetricAlarm_AlarmActions_ec2Automate (214.88s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/cloudwatch	216.268s
% make testacc TESTS=TestAccCloudWatchMetricStream_ PKG=cloudwatch
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/cloudwatch/... -v -count 1 -parallel 20 -run='TestAccCloudWatchMetricStream_'  -timeout 180m
--- SKIP: TestAccCloudWatchMetricStream_includeFilters (70.10s)
--- SKIP: TestAccCloudWatchMetricStream_update (70.10s)
--- SKIP: TestAccCloudWatchMetricStream_tags (70.10s)
--- SKIP: TestAccCloudWatchMetricStream_excludeFilters (70.10s)
--- SKIP: TestAccCloudWatchMetricStream_namePrefix (70.10s)
--- SKIP: TestAccCloudWatchMetricStream_noName (70.11s)
--- SKIP: TestAccCloudWatchMetricStream_updateName (119.92s)
--- SKIP: TestAccCloudWatchMetricStream_basic (141.97s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/cloudwatch	143.419s

[github-actions]

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[github-actions]

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