Create an app only when needed

Changes

• App is not created upon first visit, and is only created when needed

Test Plan

No auto-registering of apps upon first visit:

• Open private window
• Open devtools
• Open pleroma-fe
• Verify no request to POST /api/v1/apps is made

Auth functionalities:

• In private window and normal window, verify registration and login still works
• Refresh, verify we are still logged in, and can access authenticated APIs

added needs-review label

requested review from @hj

changed the description

added 5 commits

• c3d0d8c8...1bdf67c0 - 4 commits from branch develop
• 3a4cdbef - Create an app only when needed

Compare with previous version

mentioned in commit 7ba5e6d3

merged

mentioned in issue #1362 (closed)

mentioned in issue #1367 (closed)