* Add mechanism to check only one instance of the app is running
This isn't used yet, but will form part of the solution to
https://github.com/vector-im/element-web/issues/25157.
* disable instrumentation for SessionLock
* disable coverage reporting
* exclude SessionLock in sonar.properties
* Revert "disable coverage reporting"
This reverts commit 80c4336f76ec8e47e376b6744ef612a73299d14f.
* only disable session storage
* use pagehide instead of visibilitychange
* Add `checkSessionLockFree`
* Give up waiting for a lock immediately when someone else claims
* Update src/utils/SessionLock.ts
