executor, privilege: require CONFIG privilege for is.cluster_hardware

[mjonss]

What problem does this PR solve?

Issue Number: close #26121

Problem Summary:
The cluster_hardware table should require the CONFIG privilege. This is consistent with the behavior change in #25379 which requires CONFIG for SHOW CONFIG.

It makes sense to cherry pick to 5.1, but not 5.0; because the behavior in 5.0 was not established yet, and SHOW CONFIG still requires no privileges.

What is changed and how it works?

What's Changed:

Reading from the table information_schema.cluster_hardware now requires the CONFIG privilege.

Check List

Tests

• Unit test

Side effects

• Breaking backward compatibility (for security)

Release note

• Reading from the table information_schema.cluster_hardware now requires the CONFIG privilege.

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[mjonss]

Superseded by #26220

[ti-chi-bot]

@mjonss: PR needs rebase.

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