Enable unexported-return linter rule

[ivanvc]

What would you like to be added?

There are two remaining linter rules that we haven't enabled but are left as TODO (./tools/.golangci.yaml): exported and unexported-return. The former will have significant changes to exported functions and interfaces. The latter, even though it impacts exported structs, it's for the better (it exposes them without breaking client implementations).

I suggest breaking the pull requests into small tasks like we did on #17578.

The following modules have warnings to be addressed:

• api
• pkg
• client/pkg
• client/v3
• server
• tests

Refer to the attached log file with the result from KEEP_GOING_MODULE=true make verify-lint.

Why is this needed?

To improve the quality of the code.

[ivanvc]

/assign @thedtripp

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In response to this:

/assign @thedtripp

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[ivanvc]

@jmhbnz, could this be a bug? @thedtripp is already part of our org 🤔

Edit: I think it's because he doesn't belong to any teams. Should he open a pull request to add himself to the members? (https://github.com/kubernetes/org/blob/main/config/etcd-io/sig-etcd/teams.yaml#L77)

[thedtripp]

I'd like to work on this issue.

[thedtripp]

/assign @thedtripp

[jmhbnz]

@jmhbnz, could this be a bug? @thedtripp is already part of our org 🤔

Edit: I think it's because he doesn't belong to any teams. Should he open a pull request to add himself to the members? (https://github.com/kubernetes/org/blob/main/config/etcd-io/sig-etcd/teams.yaml#L77)

Good spotting - Yes this should be tidied up, @thedtripp please feel free to raise a kubernetes/org pr to add yourself to the members team 🙏🏻

[thedtripp]

@jmhbnz, could this be a bug? @thedtripp is already part of our org 🤔
Edit: I think it's because he doesn't belong to any teams. Should he open a pull request to add himself to the members? (https://github.com/kubernetes/org/blob/main/config/etcd-io/sig-etcd/teams.yaml#L77)

Good spotting - Yes this should be tidied up, @thedtripp please feel free to raise a kubernetes/org pr to add yourself to the members team 🙏🏻

I'll raise that PR in the next few days. Thanks!