[stable20] Allow to force rename a conflicting calendar

[backportbot-nextcloud]

backport of #24604

[faily-bot]

🤖 beep boop beep 🤖

Here are the logs for the failed build:

Status of 640: failure

jsunit

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integration-ratelimiting

• failure block could not be found - most likely this run got canceled

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+ bash tests/drone-run-integration-tests.sh || exit 0
=========================
= List of changed files =
=========================
apps/dav/lib/CalDAV/CalDavBackend.php
apps/dav/lib/Command/MoveCalendar.php
=========================
PHP files are modified
+ ./occ maintenance:install --admin-pass=admin --data-dir=/dev/shm/nc_int
Nextcloud was successfully installed
+ ./occ config:system:set redis host --value=cache
System config value redis => host set to string cache
+ ./occ config:system:set redis port --value=6379 --type=integer
System config value redis => port set to integer 6379
+ ./occ config:system:set redis timeout --value=0 --type=integer
System config value redis => timeout set to integer 0
+ ./occ config:system:set --type string --value "\OC\Memcache\Redis" memcache.local
System config value memcache.local set to string \OC\Memcache\Redis
+ ./occ config:system:set --type string --value "\OC\Memcache\Redis" memcache.distributed
PHP Warning: Redis::connect(): php_network_getaddresses: getaddrinfo failed: Name or service not known in /drone/src/lib/private/RedisFactory.php on line 92
An unhandled exception has been thrown:
RedisException: Redis server went away in /drone/src/lib/private/Memcache/Redis.php:55
Stack trace:
#0 /drone/src/lib/private/Memcache/Redis.php(55): Redis->get('ed2e8837e931e84...')
#1 /drone/src/lib/private/App/InfoParser.php(58): OC\Memcache\Redis->get('/drone/src/apps...')
#2 /drone/src/lib/private/App/AppManager.php(511): OC\App\InfoParser->parse('/drone/src/apps...')
#3 /drone/src/lib/private/legacy/OC_App.php(581): OC\App\AppManager->getAppInfo('files', false, NULL)
#4 /drone/src/lib/private/AppFramework/App.php(69): OC_App::getAppInfo('files')
#5 /drone/src/lib/private/legacy/OC_App.php(264): OC\AppFramework\App::buildAppNamespace('files')
#6 /drone/src/lib/private/AppFramework/Bootstrap/Coordinator.php(100): OC_App::registerAutoloading('files', '/drone/src/apps...')
#7 /drone/src/lib/base.php(644): OC\AppFramework\Bootstrap\Coordinator->runRegistration()
#8 /drone/src/lib/base.php(1091): OC::init()
#9 /drone/src/console.php(49): require_once('/drone/src/lib/...')
#10 /drone/src/occ(11): require_once('/drone/src/cons...')
#11 {main}```
</details>