Remove temporary GOPATH generation in in update-codegen.sh and update-openapigen.sh.

[twoGiants]

Note

Since the merge of #8482 the code generation in the main branch is faster, 6min 45s but still downloads a lot of packages every time. With this PR the downloads will be reduced but not eliminated, it will run in 4min. The run time depends on your connection.

Changes

Remove temporary GOPATH directory generation in update-codegen.sh and update-openapigen.sh.

The project uses Go modules but the code generation script executed by make generated uses a legacy workflow creating a temporary GOPATH directory and downloading all dependencies needed for code generation on every run. This takes 15-20 min for every execution.

Removing setup-temporary-gopath.sh and its references falls back to using Go modules and make generated executes under 2 min.

Closes #8718.

/kind cleanup

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Release Notes

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[twoGiants]

/kind cleanup

[twoGiants]

/test check-pr-has-kind-label

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[afrittoli]

Thanks! Once rebased, it can be merged
/lgtm

[twoGiants]

@afrittoli I rebased the branch. I updated the PR message. Now that Vincents Go update was made and the code generation scripts were updated the change is not as significant but still an improvement. See my message above.

Thanks for reviewing!

[afrittoli]

Thank you!
/lgtm