feat: add missing stubs to fix psalm errors

[cristianscheid]

• Resolves: #

Summary

• depends on chore(ci): update workflow templates #198 being merged first
• adds missing stubs to solve the following psalm errors:

Error: lib/Master.php:46:3: UndefinedClass: Class, interface or enum named OC\Core\Service\LoginFlowV2Service does not exist (see https://psalm.dev/019)
Error: lib/Master.php:280:40: UndefinedClass: Class, interface or enum named OC\Core\Controller\ClientFlowLoginV2Controller does not exist (see https://psalm.dev/019)
Error: lib/Master.php:282:15: UndefinedClass: Class, interface or enum named OC\Core\Service\LoginFlowV2Service does not exist (see https://psalm.dev/019)

• stubs were added using https://codeberg.org/provokateurin/php-stubs-updater/

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)
• Labels added where applicable (ex: bug/enhancement, 3. to review, feature component)
• Milestone added for target branch/version (ex: 32.x for stable32)

AI (if applicable)

• The content of this PR was partly or fully generated using AI