[RELEASE] 4.2.1_oem

[jesmrec]

TASKS:

• [x] [GIT] Create a new branch release/4.2.1_oem (optional)
• [x] [DIS] Update release notes in app with the proper content for oem release
• [x] [GIT] Create and sign tag v4.2.1_oem in HEAD commit of release/4.2.1_oem branch
• [x] [DEV] Approve and merge changes in ownBrander
  • [x] Links with a proper scheme
  • [x] Number of uploads to refresh
  • [x] Redact auth information in logs
  • [x] Add login_hint and user to the OIDC authentication request
  • [x] Update version number in ownBrander
• [x] [OPS] Block oB button
• [x] [OPS] Deploy oB
• [x] [DEV] Merge changes in scripts -> this is the first version without submodules
• [x] [QA] Generate final APKs files from signed commit in builder machine and perform some basic checks:
  • [x] Installation of apk/aab generated by builder machine
  • [x] Test links with a proper scheme
  • [x] Test number of uploads to refresh
  • [x] Test redact auth information in logs
  • [x] Test login_hint and user to the OIDC authentication request
  • [x] App update from previous version (generated in advance)
• [x] [QA] Notify result in #ownbrander
• [x] [OPS] Enable button

[jesmrec]

Everything done!