move globalStorageHome, workspaceStorageHome to shared env-service, https://github.com/microsoft/vscode/issues/101857

Fixes #101540

CSP such as https://*.example.com/bla/ don't seem valind. Instead use one that looks like `https://*.example.com`

_serviceBrand is only used for typing and should not result in emit

Also adds readonly

- separate enabling sync by default and logged in account

- Get conflicts resources from syncronisers
- adjust conflicts handling methods to take conflicts resources
- fix back up local data before accepting incoming changes