Fetch default privacy scopes and set properties appropriate

[bjalbor]

Fetch default values for privacy scopes and use these for user provisioning instead of always take 'v2-local' which will reveal sensitive information on default (closes #1047)

[bjalbor]

I had to force-push because I somehow missed to check if a default value for BIRTHDAY is already available for using in case of gender (which is - like PRONOUNS - not availible before NC v31). Sorry for that.

[julien-nc]

Thanks a lot for this PR!

A few minor change requests and we're good to go.

[julien-nc]

If you rebase on the main branch, you'll get rid of one Psalm issue (UndefinedConstant: Constant OCP\Accounts\IAccountManager::PROPERTY_FEDIVERSE is not defined).

The other one (UndefinedClass: Class, interface or enum named OC\Accounts\AccountManager does not exist) I can fix later.

[julien-nc]

Thanks for the changes. Just a few more things to turn the CI green:

• Run composer i ; composer run cs:fix to fix the indentation
• Add <referencedClass name="OC\Accounts\AccountManager" /> after line 46 of the /psalm.xml file. This will fix the psalm error.
• Update your local main branch and rebase your branch on top of it. As there is no conflict, the rebase is painless:

git checkout main
git pull https://github.com/nextcloud/user_oidc main
git checkout feat/1047/user-provisioning-privacy-scopes
git rebase main
git push YOUR_REPO YOUR_BRANCH

[julien-nc]

Thanks a lot for the fixes and for your patience!

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