Add wp_after_tag_search filter

[grandeljay]

https://core.trac.wordpress.org/ticket/55606

I want to create a plugin which suggests existing tags, if they are similar to existing tags. For this I want to hook into the term results, but it seems there is no way to. This filter should solve that.

[github-actions]

Hi @grandeljay! 👋

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[costdev]

Thanks for the PR! I have left some thoughts below.

[costdev]

Just a couple more suggested changes and then I think this is ready for commit consideration when the 6.1 branch opens.

Nice work @grandeljay!

[grandeljay]

I think I figured out what went wrong with the unit test. It should work now 👍🏼

[costdev]

LGTM 👍

[SergeyBiryukov]

Looks good to me, thanks! 👍

[audrasjb]

Committed in https://core.trac.wordpress.org/changeset/53781