fix: deprecation warning in the comment command

[alan910127]

Description

Fix the deprecation warning of using the showChanges API from @gitbeaker/rest.

Current Behavior

$ pnpm changesets-gitlab comment
DeprecationWarning: This endpoint was deprecated in Gitlab API 15.7 and will be removed in API v5. Please use the "allDiffs" function instead.
(Use `node --trace-deprecation ...` to show where the warning was created)

Expected Behavior

No warning was emitted.

Additional Information

I changed the type of the argument in the hasChangesetBeenAdded function from the inferred type

ReturnType<MergeRequests['allDiffs']>

to the concrete type

Promise<MergeRequestDiffSchema[]>

because I think checking something we don't really use (paginated or not) does not make a lot of sense.

[changeset-bot]

🦋 Changeset detected

Latest commit: 86df78d

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
changesets-gitlab	Patch

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[JounQin]

You're on fire! Thanks very much.