refactor(meta): reject directly setting license key when it's managed by watching a file

[BugenZhao]

I hereby agree to the terms of the RisingWave Labs, Inc. Contributor License Agreement.

What's changed and what's your intention?

When --license-key-path is specified, license key from initial system parameters or future ALTERing can easily get overwritten. In this PR, we reject such cases to avoid confusion.

Checklist

• I have written necessary rustdoc comments
• I have added necessary unit tests and integration tests
• All checks passed in ./risedev check (or alias, ./risedev c)

Documentation

• My PR needs documentation updates. (Please use the Release note section below to summarize the impact on users)

Release note

If this PR includes changes that directly affect users or other significant modifications relevant to the community, kindly draft a release note to provide a concise summary of these changes. Please prioritize highlighting the impact these changes will have on users.

[BugenZhao]

• fix(meta): rename --license-key-file to --license-key-path #18838
• refactor(meta): reject directly setting license key when it's managed by watching a file #18823 👈
• main

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Merge activity

• Oct 10, 5:25 AM EDT: Graphite couldn't merge this PR because it failed for an unknown reason (This repository has GitHub's merge queue enabled, which is currently incompatible with Graphite).
• Oct 11, 12:47 AM EDT: A user started a stack merge that includes this pull request via Graphite.
• Oct 11, 12:47 AM EDT: Graphite couldn't merge this PR because it failed for an unknown reason (This repository has GitHub's merge queue enabled, which is currently incompatible with Graphite).