[Telemetry Table] Telemetry mode bug fixes

[jvigliotta]

Closes #7268

Describe your changes:

Specifically addresses these issues: #7268 (comment)

• will set any existing tables to the defaults for TelemetryMode (default mode is limited)
• fixes error on save
• fixes telemetry mode and persist mode changes not working when changed at the same time

All Submissions:

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• Is this a notable change that will require a special callout in the release notes? For example, will this break compatibility with existing APIs or projects that consume these plugins?

Author Checklist

• Changes address original issue?
• Tests included and/or updated with changes?
• Has this been smoke tested?
• Have you associated this PR with a type: label? Note: this is not necessarily the same as the original issue.
• Have you associated a milestone with this PR? Note: leave blank if unsure.
• Testing instructions included in associated issue OR is this a dependency/testcase change?

Reviewer Checklist

• Changes appear to address issue?
• Reviewer has tested changes by following the provided instructions?
• Changes appear not to be breaking changes?
• Appropriate automated tests included?
• Code style and in-line documentation are appropriate?

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 56.15%. Comparing base (a01f210) to head (db41a99).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7601      +/-   ##
==========================================
- Coverage   56.63%   56.15%   -0.48%     
==========================================
  Files         672      672              
  Lines       27111    27116       +5     
  Branches     2635     2635              
==========================================
- Hits        15354    15228     -126     
- Misses      11432    11561     +129     
- Partials      325      327       +2     

Flag	Coverage Δ
e2e-full	23.59% <25.00%> (-24.11%)	⬇️
e2e-stable	59.92% <87.50%> (-0.03%)	⬇️
unit	49.12% <66.66%> (-0.02%)	⬇️

Files	Coverage Δ
src/plugins/telemetryTable/TelemetryTable.js	79.80% <100.00%> (-0.99%)	⬇️
...gins/telemetryTable/TelemetryTableConfiguration.js	63.63% <100.00%> (+0.47%)	⬆️
src/plugins/telemetryTable/TelemetryTableType.js	100.00% <100.00%> (ø)
src/plugins/telemetryTable/TelemetryTableView.js	89.47% <ø> (ø)
src/plugins/telemetryTable/plugin.js	100.00% <100.00%> (ø)
...s/telemetryTable/TableConfigurationViewProvider.js	62.50% <0.00%> (ø)
...ugins/telemetryTable/components/TableComponent.vue	41.44% <42.85%> (-0.41%)	⬇️

... and 15 files with indirect coverage changes

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[davetsay]

Flawless