[fix](case) check_hash_bucket_table: quote db/table identifiers

[shuke987]

Problem

This global check iterates over all databases/tables and builds statements like show create table ${tblName} without backticks. When another suite leaves behind a table named with a reserved word (e.g. order), the statement becomes show create table order → mismatched input 'order', which fails the whole check. This only triggers under the full P0 pipeline (cross-suite residue), not when the suite runs in isolation.

Fix

Backtick all db / table / partition identifiers (use, desc, show create table, show partitions, show replica status, and the select ... from db.table).

Verification

Ran the suite on a branch-4.1 local cluster — passes.

🤖 Generated with Claude Code

[hello-stephen]

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Please clearly describe your PR:

1. What problem was fixed (it's best to include specific error reporting information). How it was fixed.
2. Which behaviors were modified. What was the previous behavior, what is it now, why was it modified, and what possible impacts might there be.
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4. Which code was refactored and why was this part of the code refactored?
5. Which functions were optimized and what is the difference before and after the optimization?

[shuke987]

run buildall