Upstream: Add labels to published execution events

[katrogan]

Why are the changes needed?

Allows consumers to filter on arbitrary labels for execution events

What changes were proposed in this pull request?

Current state of t he world.

How was this patch tested?

Deployed to an internal setup and verified labels came through with cloud events.

Setup process

Screenshots

Check all the applicable boxes

• I updated the documentation accordingly.
• All new and existing tests passed.
• All commits are signed-off.

Related PRs

Docs link

[codecov]

Codecov Report

Attention: Patch coverage is 2.32558% with 42 lines in your changes missing coverage. Please review.

Project coverage is 36.98%. Comparing base (d770918) to head (6a3ff58).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...cloudevent/implementations/cloudevent_publisher.go	0.00%	26 Missing ⚠️
...lyteidl/gen/pb-go/flyteidl/event/cloudevents.pb.go	6.25%	15 Missing ⚠️
flyteadmin/pkg/async/cloudevent/factory.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6104      +/-   ##
==========================================
- Coverage   36.99%   36.98%   -0.01%     
==========================================
  Files        1318     1318              
  Lines      132406   132439      +33     
==========================================
  Hits        48979    48979              
- Misses      79174    79207      +33     
  Partials     4253     4253              

Flag	Coverage Δ
unittests-datacatalog	51.58% <ø> (ø)
unittests-flyteadmin	54.06% <0.00%> (-0.05%)	⬇️
unittests-flytecopilot	30.99% <ø> (ø)
unittests-flytectl	62.29% <ø> (ø)
unittests-flyteidl	7.23% <6.25%> (-0.01%)	⬇️
unittests-flyteplugins	53.82% <ø> (ø)
unittests-flytepropeller	42.60% <ø> (ø)
unittests-flytestdlib	55.17% <ø> (ø)

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