Add is_eager bit to indicate eager tasks in flyte system (#6041)

[wild-endeavor]

cherry-pick 25c89ee

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 15 lines in your changes missing coverage. Please review.

Project coverage is 36.79%. Comparing base (730c502) to head (c86487e).
Report is 1 commits behind head on release-v1.13.

Files with missing lines	Patch %	Lines
...eidl/gen/pb-go/flyteidl/admin/node_execution.pb.go	0.00%	5 Missing ⚠️
flyteidl/gen/pb-go/flyteidl/core/tasks.pb.go	0.00%	5 Missing ⚠️
flyteidl/gen/pb-go/flyteidl/event/event.pb.go	0.00%	5 Missing ⚠️

Additional details and impacted files

@@                Coverage Diff                @@
##           release-v1.13    #6066      +/-   ##
=================================================
- Coverage          36.80%   36.79%   -0.01%     
=================================================
  Files               1309     1309              
  Lines             131026   131041      +15     
=================================================
+ Hits               48221    48222       +1     
- Misses             78612    78626      +14     
  Partials            4193     4193              

Flag	Coverage Δ
unittests-datacatalog	51.58% <ø> (ø)
unittests-flyteadmin	54.03% <ø> (ø)
unittests-flytecopilot	11.73% <ø> (ø)
unittests-flytectl	62.40% <ø> (ø)
unittests-flyteidl	6.90% <0.00%> (-0.01%)	⬇️
unittests-flyteplugins	53.67% <ø> (ø)
unittests-flytepropeller	42.88% <ø> (ø)
unittests-flytestdlib	55.42% <ø> (+0.01%)	⬆️

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