Fix stacked plots legend

[shefalijoshi]

Closes #6176 #6158 #6209 #6231 #6159 #6176

Describe your changes:

• Remove plot legend from mct plot component, add a slot for it instead
• Remove reactivity for plot legend from stacked plots view
• Add plot legend to the Plot component
• Handle addition and removal of series with the PlotLegend
• Add listener for series color changes to the y axis component
• Remove composition watchers for stacked plots from the SeriesCollection - this is necessary in order to ensure the plot configuration for series within the stacked plot (that are not overlay plots) are added only once (from the StackedPlotItem)
• Fix a bug where moving from an overlay plot to a simple plot and back would cause an error in the elements pool.
• Removed extra redraws of plots happening when calculating limit lines
• Fixed annotation editing for telemetry objects
• Fixed annotation editing for Stacked Plots
• Fixed annotation editing in Display Layouts containing Stacked Plots
• Fixed e2e test for annotations with CouchDB

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 change backwards compatible? For example, developers won't need to change how they are calling the API or how they've extended core plugins such as Tables or Plots.

Author Checklist

• Changes address original issue?
• Tests included and/or updated with changes?
• Command line build passes?
• Has this been smoke tested?
• 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?
• Has associated issue been labelled unverified? (only applicable if this PR closes the issue)
• Has associated issue been labelled bug? (only applicable if this PR is for a bug fix)

[codecov]

Codecov Report

Merging #6199 (1673aa3) into master (393c801) will increase coverage by 0.50%.
The diff coverage is 68.94%.

@@            Coverage Diff             @@
##           master    #6199      +/-   ##
==========================================
+ Coverage   54.86%   55.36%   +0.50%     
==========================================
  Files         607      607              
  Lines       25951    26036      +85     
  Branches     2350     2370      +20     
==========================================
+ Hits        14238    14416     +178     
+ Misses      11045    10960      -85     
+ Partials      668      660       -8     

Flag	Coverage Δ		*Carryforward flag
e2e-ci	39.49% <100.00%> (ø)		Carriedforward from 6d63339
e2e-full	51.23% <100.00%> (ø)		Carriedforward from 6d63339
e2e-stable	53.89% <85.71%> (+0.97%)	⬆️
unit	50.16% <68.75%> (+0.62%)	⬆️

*This pull request uses carry forward flags. Click here to find out more.

Impacted Files	Coverage Δ
src/plugins/notebook/components/Notebook.vue	20.93% <0.00%> (ø)
src/plugins/notebook/components/NotebookEntry.vue	16.93% <ø> (ø)
src/plugins/plot/chart/MctChart.vue	44.64% <ø> (+3.67%)	⬆️
src/plugins/plot/stackedPlot/StackedPlotItem.vue	60.60% <ø> (-0.73%)	⬇️
...lugins/plot/stackedPlot/StackedPlotViewProvider.js	72.22% <ø> (-20.64%)	⬇️
src/ui/inspector/PlotElementsPool.vue	0.95% <0.00%> (-0.01%)	⬇️
src/ui/layout/search/AnnotationSearchResult.vue	35.13% <ø> (ø)
src/plugins/plot/MctPlot.vue	37.55% <3.57%> (-1.44%)	⬇️
...inspector/annotations/AnnotationsInspectorView.vue	27.14% <45.45%> (-0.13%)	⬇️
src/plugins/plot/inspector/PlotOptionsEdit.vue	58.00% <66.66%> (-1.19%)	⬇️
... and 38 more

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[scottbell]

Annotation testing instructions:
#5853 (comment)