chore!: remove Allow Anonymous Write setting and anonymous role

[KevLehman]

Proposed changes (including videos or screenshots)

Follow-up to CORE-1514 (deprecation note). Removes the "Allow Anonymous Write" feature entirely:

• Accounts_AllowAnonymousWrite setting and its deprecation alert
• "Or talk as anonymous" composer action (ComposerAnonymous now only offers sign in)
• anonymous branch of the registerUser method (no more user creation without email); method signature narrowed on server and @rocket.chat/ui-client types
• anonymous role: dropped from default permissions, role seeding and role priority order; runAfterVerifyEmail / deprecated afterVerifyEmail method removed (their only job was promoting anonymous users)
• related i18n keys across all locales, e2e page object and "chat as anonymous" test

Migration v338:

1. deletes the Accounts_AllowAnonymousWrite setting document
2. deactivates and logs out any existing users holding the anonymous role
3. pulls anonymous from every permission's role list and deletes the role document

Anonymous read (Accounts_AllowAnonymousRead) is untouched. The $ne: 'anonymous' filters in Users/Sessions stats aggregations are kept on purpose since historical user/session documents still carry the role id.

Issue(s)

https://rocketchat.atlassian.net/browse/CORE-1514

Steps to test or reproduce

1. On a pre-9.0 database with Accounts_AllowAnonymousWrite enabled and at least one anonymous-role user, start the server on this branch.
2. Confirm rocketchat_settings no longer has Accounts_AllowAnonymousWrite, rocketchat_roles has no anonymous doc, and no permission lists anonymous.
3. Confirm the former anonymous user is active: false and cannot resume its session.
4. Enable Accounts_AllowAnonymousRead, open a public channel logged out: composer only shows "Sign in to start talking".
5. Admin > Settings > Accounts: the "Allow Anonymous Write" toggle is gone.

Further comments

Changeset marks @rocket.chat/meteor, @rocket.chat/i18n and @rocket.chat/ui-client as major.

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[changeset-bot]

🦋 Changeset detected

Latest commit: 5a26e27

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

This PR includes changesets to release 11 packages

Name	Type
@rocket.chat/meteor	Major
@rocket.chat/i18n	Major
@rocket.chat/ui-client	Major
@rocket.chat/mock-providers	Patch
@rocket.chat/ui-contexts	Major
@rocket.chat/web-ui-registration	Major
@rocket.chat/omnichannel-transcript	Patch
@rocket.chat/omnichannel-services	Patch
@rocket.chat/ui-composer	Major
@rocket.chat/core-typings	Major
@rocket.chat/rest-typings	Major

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[codecov]

Codecov Report

❌ Patch coverage is 37.50000% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 68.84%. Comparing base (2127948) to head (5a26e27).

Additional details and impacted files

@@                Coverage Diff                @@
##           release-9.0.0   #41828      +/-   ##
=================================================
- Coverage          69.35%   68.84%   -0.51%     
=================================================
  Files               4201     4133      -68     
  Lines             166609   158124    -8485     
  Branches           29743    28062    -1681     
=================================================
- Hits              115549   108858    -6691     
+ Misses             45920    44119    -1801     
- Partials            5140     5147       +7     

Flag	Coverage Δ
e2e	59.17% <0.00%> (-0.05%)	⬇️
e2e-api	46.05% <33.33%> (+0.01%)	⬆️
unit	70.54% <100.00%> (-0.67%)	⬇️

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