Chore: Remove unused Go code (#28852)

* Chore: Remove more unused Go code

Signed-off-by: Arve Knudsen <arve.knudsen@gmail.com>

pkg/cmd/grafana-cli/utils/command_line.go

@@ -61,7 +61,3 @@ func (c *ContextCommandLine) RepoDirectory() string {
 func (c *ContextCommandLine) PluginURL() string {
 	return c.String("pluginUrl")
 }
-
-func (c *ContextCommandLine) OptionsString() string {
-	return c.String("configOverrides")
-}