Fix Dolt backend init/daemon/doctor; prevent accidental SQLite artifacts; add integration tests; clean up lint (#1218)

* /{cmd,internal}: get dolt backend init working and allow issue creation

* /{website,internal,docs,cmd}: integration tests and more split backend fixes

* /{cmd,internal}: fix lint issues

* /cmd/bd/doctor/integrity.go: fix unable to query issues bug with dolt backend

* /cmd/bd/daemon.go: remove debug logging

internal/config/sync.go

@@ -21,7 +21,7 @@ var ConfigWarningWriter io.Writer = os.Stderr
 // logConfigWarning logs a warning message if ConfigWarnings is enabled.
 func logConfigWarning(format string, args ...interface{}) {
 	if ConfigWarnings && ConfigWarningWriter != nil {
-		fmt.Fprintf(ConfigWarningWriter, format, args...)
+		_, _ = fmt.Fprintf(ConfigWarningWriter, format, args...)
 	}
 }