added execution environment protos

[hamersaw]

Tracking issue

NA

Why are the changes needed?

Necessary to add support for assigning execution environments at workflow execution.

What changes were proposed in this pull request?

Adding execution environment protos.

How was this patch tested?

Locally.

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

NA

Docs link

NA

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.20%. Comparing base (88a2f50) to head (481c8a5).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5311   +/-   ##
=======================================
  Coverage   60.20%   60.20%           
=======================================
  Files         646      646           
  Lines       45654    45654           
=======================================
  Hits        27487    27487           
  Misses      15575    15575           
  Partials     2592     2592           

Flag	Coverage Δ
unittests-datacatalog	69.31% <ø> (ø)
unittests-flyteadmin	58.82% <ø> (ø)
unittests-flytecopilot	17.79% <ø> (ø)
unittests-flyteidl	79.30% <ø> (ø)
unittests-flyteplugins	61.94% <ø> (ø)
unittests-flytepropeller	57.32% <ø> (ø)
unittests-flytestdlib	65.75% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.