[MAINT] Remove unnecessary separate API call for repo topics in github_repository

[deiga]

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Before the change?

• Configuring topics for a github_repository would always do a separate API call to update topics, even though the Repo API nowadays supports topics directly

After the change?

• No extra API calls when configuring topics for github_repository resources

Pull request checklist

• Schema migrations have been created if needed (example)
• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)

Does this introduce a breaking change?

Please see our docs on breaking changes to help!

• Yes
• No

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[github-actions]

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[stevehipwell]

@deiga have you seen the comment at the top of the edit repo REST API docs about updating topics?

[deiga]

@deiga have you seen the comment at the top of the edit repo REST API docs about updating topics?

Yeah, I spotted it yesterday and re-drafted this. There is still useful cleanup here

[stevehipwell]

This looks good in principal, just a few suggesitons/questions.

[deiga]

@stevehipwell Thanks for the review, I've addressed your comments

[stevehipwell]

LGTM

[stevehipwell]

@deiga could you please rebase this PR?

[stevehipwell]

LGTM