chore(models): remove obsolete notification indexes

[AlgoArtist06]

Proposed changes

• remove the stale compatibility TODO for the subscription notification-preference indexes
• remove the commented-out desktopNotifications, mobilePushNotifications, and emailNotifications index declarations now that their consumers are gone

Closes #41318

Changeset

No changeset is required because this is internal comment cleanup only; it does not change runtime behavior or the published package API.

Testing

• yarn turbo run build --filter=@rocket.chat/models...
• yarn workspace @rocket.chat/models lint (passes with existing warnings)
• yarn workspace @rocket.chat/models typecheck
• yarn workspace @rocket.chat/models test --runInBand (2 suites, 16 tests)

[dionisio-bot]

Looks like this PR is not ready to merge, because of the following issues:

• This PR is missing the 'stat: QA assured' label
• This PR is missing the required milestone or project

Please fix the issues and try again

If you have any trouble, please check the PR guidelines

[CLAassistant]

All committers have signed the CLA.

[changeset-bot]

⚠️ No Changeset found

Latest commit: aab9070

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

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[coderabbitai]

Walkthrough

Removes a TODO and commented-out deprecated index definitions from the subscription model’s MongoDB index list. No active index or query behavior changes.

Changes

Subscription index cleanup

Layer / File(s)	Summary
Remove obsolete index comments packages/models/src/models/Subscriptions.ts	Removes the deprecated commented-out notification index definitions and their TODO from SubscriptionsRaw.modelIndexes().

Estimated code review effort: 1 (Trivial) | ~2 minutes

Suggested labels: type: chore

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	The PR removes the obsolete desktop, mobile, and email notification index declarations requested in #41318.
Out of Scope Changes check	✅ Passed	The change stays focused on deleting the stale index declarations and TODO, with no unrelated code added.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main change: removing obsolete notification indexes from the models package.

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[cubic-dev-ai]

No issues found across 1 file

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[AlgoArtist06]

Reviewed the automated feedback. CodeRabbit reported no actionable comments and all of its pre-merge checks passed. This PR only removes stale comments, so it does not require a changeset or package version bump. The CLA signature and upstream-managed QA/milestone metadata remain as workflow gates.