[fix](cooldown) Fix deadlock in tablet clone

[platoneko]

Proposed changes

Issue Number: close #xxx

Problem summary

Tablet::create_rowset acquires shared _meta_lock, while caller already holds the exclusive _meta_lock.

Checklist(Required)

• [ ] Does it affect the original behavior
• [ ] Has unit tests been added
• [ ] Has document been added or modified
• [ ] Does it need to update dependencies
• [x] Is this PR support rollback (If NO, please explain WHY)

Further comments

If this is a relatively large or complex change, kick off the discussion at [email protected] by explaining why you chose the solution you did and what alternatives you considered, etc...

[platoneko]

run buildall

[github-actions[bot]]

clang-tidy review says "All clean, LGTM! :+1:"

[platoneko]

run p0

[platoneko]

run NereidsP0

[platoneko]

run p0

[platoneko]

run buildall

[github-actions[bot]]

clang-tidy review says "All clean, LGTM! :+1:"

[github-actions[bot]]

clang-tidy review says "All clean, LGTM! :+1:"

[platoneko]

run buildall

[platoneko]

run p0

[github-actions[bot]]

PR approved by at least one committer and no changes requested.

[github-actions[bot]]

PR approved by anyone and no changes requested.