Remove unused reject argument for mockQueryManager and mockWatchQuery

[jerelmiller]

While working on #10502, I noticed that mockQueryManager and mockWatchQuery both took a reject argument, but this argument wasn't used. For added simplicity, I simply removed this argument and updated all references to it accordingly.

These are internal testing utilities, so the breaking change to the API won't affect users.

Checklist:

• If this PR contains changes to the library itself (not necessary for e.g. docs updates), please include a changeset (see CONTRIBUTING.md)
• If this PR is a new feature, please reference an issue where a consensus about the design was reached (not necessary for small changes)
• Make sure all of the significant new logic is covered by tests

[changeset-bot]

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Latest commit: 257a524

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[alessbell]

Good find! LGTM