Fix "Suppress Active Issues" for project/solution command to use the diagnostics directly from the diagnostic service, instead of the error list. This has multiple benefits:

1. We don't need to wait for error list to be force updated to start computing the suppressions fix. It can take quite a while for error list to reach to stable state

2. We don't do unneccessary mapping from error list entry to roslyn diagnostic snapshots and also don't need to do any filtering of stale diagnostics.