feat(dav): store multiple default calendar alarms as JSON #5351

Job	Run time
gate	8s
Playwright setup	5m 32s
Playwright tests for installer	8m 35s
Playwright tests 4 / 8	8m 49s
Playwright tests 2 / 8	6m 18s
Playwright tests 8 / 8	8m 43s
Playwright tests 1 / 8	10m 38s
Playwright tests 6 / 8	9m 44s
Playwright tests 3 / 8	10m 54s
Playwright tests 5 / 8	8m 3s
Playwright tests 7 / 8	13m 9s
playwright-test-summary	7s
merge-reports	57s
	1h 31m 37s

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