fix: persist customized file request share tokens

[mvanhorn]

• Resolves Customizing a File Request share token updates the UI but does not persist the new token #60144

Summary

Add token persistence to the existing parameterized update query in apps/sharebymail/lib/ShareByMailProvider.php, using the supplied share's getToken() alongside the other persisted fields. Apply this consistently to email-backed shares: the existing API already accepts custom tokens for both TYPE_LINK and TYPE_EMAIL, and the thread's suggestion that email token immutability is intentional is a participant's hypothesis rather than a documented restriction in the inspected code. Extend the existing database-backed ShareByMailProviderTest::testUpdate coverage, explicitly providing the original or replacement token on share fixtures and checking the stored value; add a file-request-shaped case with a folder, CREATE permission, empty recipient, and file-request attributes.

Customizing a File Request token returns apparent success and changes the displayed link, but the persisted share retains its previous token. The reporter reproduced this on Nextcloud 33, and another participant confirmed it on version 34 and a beta. File requests created with mail sharing enabled use TYPE_EMAIL even without a recipient, so their updates reach ShareByMailProvider rather than the link-share provider. The API sets the requested token on the share object, but ShareByMailProvider::update() returns that object without writing its token to the database.

TODO

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Checklist

• Code is properly formatted
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• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
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• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)
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