Merge branch 'remove-failed-bridges' into 'master'

Remove three failed bridges

See merge request !1460
4 jobs for master in 63 minutes and 56 seconds (queued for 3 seconds)
Name Stage Failure
android test Optional Tests
Uploading artifacts for failed job
Uploading artifacts...
kernel.log: found 1 matching files and directories

logcat.txt: found 1 matching files and directories

briar-android/build/reports/androidTests/connected/flavors/*: found 31 matching files and directories

WARNING: screenshots: no matching files
Uploading artifacts as "archive" to coordinator... ok
id=9788 responseStatus=201 Created token=HQndZykK
Cleaning up file based variables
ERROR: Job failed: exit code 1