examples: remove Ruby #3329

Job	Run time
staticcheck	55s
lint	14s
tests (macos/go-1.21-amd64)	29s
tests (ubuntu/go-1.21-386)	18s
build	14s
tests (ubuntu/go-1.21-amd64)	1m 8s
tests (windows/go-1.21-386)	3m 9s
tests (windows/go-1.21-amd64)	2m 51s
tests (macos/go-1.22-amd64)	29s
tests (ubuntu/go-1.22-386)	53s
tests (ubuntu/go-1.22-amd64)	57s
tests (windows/go-1.22-386)	4m 48s
tests (windows/go-1.22-amd64)	7m 19s
test-python-example	17s
test-gsutil-example	26s
test-node-example	13s
test-go-example	31s
test-dotnet-example	13s
test-scala-example	33s
test-java-example	23s
test-cpp-example	2m 18s
test-curl-example	7s
test-curl-both-scheme-default-ports-example	11s
test-curl-both-scheme-non-default-ports-example	4s
unblock-pr	1s
	29m 1s

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