[clang-tools-extra] [clang-tidy] Add bugprone-move-shared-pointer-contents check. (PR #67467)

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pizzud wrote:

> I cleaned up the reviewers. I suggest to use `git merge` next time you need to bring your PR up to date with `main`. We are not worried about merge commits, as squash is the only available merge option for PRs.
> 

Thanks! I'll try merge next time.

> I also suggest to use "Start review" button when you respond to multiple comments, as that reduces amount of e-mail notifications.

Start review seems weird since the review is already in flight and I think I'd have to revert to draft in between - the button isn't currently visible. If it's less spammy I'm okay with it, though. I'm also used to a code review tool where the comments get batched into drafts and then you publish them all together when you have new code.

https://github.com/llvm/llvm-project/pull/67467