feat: add a setting for the default calendar url #5533

Job	Run time
php8.1 on master unit tests	29s
php8.1 on master integration tests	48s
php8.1 on stable28 unit tests	1m 13s
php8.1 on stable28 integration tests	52s
php8.2 on master unit tests	43s
php8.2 on master integration tests	2m 48s
php8.2 on stable28 unit tests	29s
php8.2 on stable28 integration tests	27s
php8.3 on master unit tests	1m 47s
php8.3 on master integration tests	4m 7s
php8.3 on stable28 unit tests	28s
php8.3 on stable28 integration tests	2m 10s
php8.0 on stable26 unit tests	33s
php8.0 on stable26 integration tests	28s
php8.1 on stable27 unit tests	27s
php8.1 on stable27 integration tests	51s
php-test-summary	6s
	18m 46s

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