* 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
* Tidy workflows
* Update get-version-from-git.sh
* Run tests in Actions
* Upload coverage to SonarCloud
* Run linters in Actions
* Run builds in Actions, consolidating with sentry uploader
* Update sonar-project.properties
* chmod +x
* Iterate
* Use new env vars
* Delete yarn-sub.js
* Use re-usable sonarqube action
* Add README badges
* Match reality
