Feature plot better utc ticks

[shefalijoshi]

Closes #977

Describe your changes:

If the time system is UTC based, generate x-axis time-series ticks that follow a better pattern than a random set of ticks.

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

❌ Patch coverage is 94.73684% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 56.43%. Comparing base (569c7ff) to head (1646bad).

Files with missing lines	Patch %	Lines
src/plugins/plot/tickUtils.js	93.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8139      +/-   ##
==========================================
- Coverage   57.23%   56.43%   -0.80%     
==========================================
  Files         700      700              
  Lines       28142    28179      +37     
  Branches     2744     2745       +1     
==========================================
- Hits        16107    15904     -203     
- Misses      11695    11935     +240     
  Partials      340      340              

Flag	Coverage Δ
e2e-ci	62.19% <93.33%> (-0.87%)	⬇️
e2e-full	23.54% <3.33%> (-18.80%)	⬇️
unit	48.37% <65.78%> (+0.01%)	⬆️

Files with missing lines	Coverage Δ
src/plugins/plot/MctPlot.vue	37.41% <100.00%> (+0.26%)	⬆️
src/plugins/plot/MctTicks.vue	78.94% <100.00%> (+0.68%)	⬆️
src/plugins/plot/axis/XAxis.vue	60.00% <100.00%> (+1.02%)	⬆️
src/plugins/plot/chart/MCTChartSeriesElement.js	79.66% <ø> (ø)
src/plugins/plot/draw/DrawWebGL.js	92.00% <ø> (ø)
src/plugins/plot/tickUtils.js	96.03% <93.33%> (-1.15%)	⬇️

... and 23 files with indirect coverage changes

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[jvigliotta]

One change in the docs, then a couple questions. Ran this locally and it is WAY nicer than the ticks we currently have!

[jvigliotta]

LOOKIN' GOOD!