Fixup flytectl

[eapolinario]

Why are the changes needed?

This PR brings the necessary changes to run flytectl CI changes in accordance with the model defined for the other components in the monorepo, including bumping the version of go (from 1.19 to 1.21).

This PR also renames the flytectl module and all its internal imports.

What changes were proposed in this pull request?

How was this patch tested?

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

[eapolinario]

The expectation is that the flytectl unit tests are going to fail.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 60.20%. Comparing base (b55026e) to head (dd777d5).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5309      +/-   ##
==========================================
+ Coverage   59.68%   60.20%   +0.51%     
==========================================
  Files         568      646      +78     
  Lines       41729    45654    +3925     
==========================================
+ Hits        24906    27486    +2580     
- Misses      14410    15576    +1166     
- Partials     2413     2592     +179     

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	65.73% <ø> (?)

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[ddl-ebrown]

🎉