Enable throttler in move-tables mode

[danieljoos]

A Pull Request should be associated with an Issue.

We wish to have discussions in Issues. A single issue may be targeted by multiple PRs.
If you're offering a new feature or fixing anything, we'd like to know beforehand in Issues,
and potentially we'll be able to point development in a particular direction.

Related issue (internal): https://github.com/github/database-infrastructure/issues/8212
Related issue (public): #1681

Further notes in https://github.com/github/gh-ost/blob/master/.github/CONTRIBUTING.md
Thank you! We are open to PRs, but please understand if for technical reasons we are unable to accept each and any PR

Description

This PR enables throttling in move-tables mode.
The code was conditionally turned off at the beginning of development.

In case this PR introduced Go code changes:

• contributed code is using same conventions as original code
• script/cibuild returns with no formatting errors, build errors or unit test errors.

[Copilot]

Pull request overview

This PR enables throttling during the main write/apply loop when running gh-ost in move-tables mode, aligning move-tables execution with the existing throttler behavior used in standard migrations.

Changes:

• Remove the move-tables-mode guard that previously disabled throttler.throttle(nil) in the executeWriteFuncs() loop.
• Ensure the write/apply loop is always subject to throttling decisions (HTTP throttling, control-replica lag, max-load/critical-load, flag-file/user throttle).

Show a summary per file

File	Description
go/logic/migrator.go	Enables throttling in move-tables mode by always calling the throttler inside the primary write/apply loop.

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• Files reviewed: 1/1 changed files
• Comments generated: 1