* Reuse MySQL and Postgres Grafana config instead of the object
- Only reuse the Grafana DB object for SQLite. Support for SQLite will be added in a different PR
- Fail when reusing the Grafana DB object if it is using DB instrumentation
- In the case that we have to reuse a Grafana DB with its instrumentation, fail with an error that describes a workaround
- Add regression tests to reproduce incident 2144
* remove temp file
* fix linter
* fix linter x2
* fix linter x3