March a11y Bug Fixes

[cRui861]

• Fix luminosity contrast ratio for "The node the task ran on doesn't exist anymore or is in an invalid state" warning for tasks by increasing background color:
  

[codecov]

Codecov Report

Merging #2472 (c948303) into master (3bd43c7) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #2472   +/-   ##
=======================================
  Coverage   64.98%   64.99%           
=======================================
  Files         914      914           
  Lines       26345    26348    +3     
  Branches     5178     5179    +1     
=======================================
+ Hits        17121    17124    +3     
  Misses       9224     9224           

Impacted Files	Coverage Δ
...sk/ui/datetime-picker/datetime-picker.component.ts	96.07% <ø> (ø)
...elect/select-dropdown/select-dropdown.component.ts	96.82% <100.00%> (+0.05%)	⬆️
src/@batch-flask/ui/select/select.component.ts	81.33% <100.00%> (+0.13%)	⬆️
src/app/utils/pool-utils.ts	83.16% <100.00%> (ø)

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[dpwatrous]

AB#291 - added a higher contrast border to code sample inputs:

[cRui861]

/azp run [BatchExplorer - CI]

[azure-pipelines]

No pipelines are associated with this pull request.

[cRui861]

/azp run BatchExplorer - CI

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