reverted mockery-v2 on ExecutionContext

[hamersaw]

Why are the changes needed?

This PR updated the mockery command to only produce mocks for the ExecutionContext interface. This blocks updating any other construct.

What changes were proposed in this pull request?

Revert the mockery generate command.

How was this patch tested?

Unit tests.

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 60.96%. Comparing base (c1563d7) to head (2688a4a).
Report is 115 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5562      +/-   ##
==========================================
- Coverage   60.98%   60.96%   -0.02%     
==========================================
  Files         796      796              
  Lines       51647    51647              
==========================================
- Hits        31497    31489       -8     
- Misses      17250    17257       +7     
- Partials     2900     2901       +1     

Flag	Coverage Δ
unittests-datacatalog	69.31% <ø> (ø)
unittests-flyteadmin	58.69% <ø> (-0.05%)	⬇️
unittests-flytecopilot	17.79% <ø> (ø)
unittests-flytectl	67.44% <ø> (ø)
unittests-flyteidl	79.06% <ø> (ø)
unittests-flyteplugins	61.85% <ø> (ø)
unittests-flytepropeller	57.42% <ø> (ø)
unittests-flytestdlib	65.60% <ø> (-0.06%)	⬇️

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