grafana-cli: Diff generated ts directly instead of relying on git (#45815)

* Add diffing support to grafana-cli cue gen-ts

* Rely on diff comparison in cuetsify pipeline step

* Ignore *.gen.ts files with eslint

* Chore: Fix lint `sdboyer/cuetsify-compare` (#45818)

* Sync drone

(cherry picked from commit 40645ab19e39ff9b0a12b7ebb13a4dc4c5e1d472)

* Fix lint

(cherry picked from commit c95ece983984432fea029335b2b729b09d76c7eb)

* Sign drone

Co-authored-by: Dimitris Sotirakis <sotirakis.dim@gmail.com>

pkg/cmd/grafana-cli/commands/commands.go

@@ -257,6 +257,11 @@ so must be recompiled to validate newly-added CUE files.`,
 				Name:  "grafana-root",
 				Usage: "path to the root of a Grafana repository in which to generate TypeScript from CUE files",
 			},
+			&cli.BoolFlag{
+				Name:  "diff",
+				Usage: "diff results of codegen against files already on disk. Exits 1 if diff is non-empty",
+				Value: false,
+			},
 		},
 	},
 }