Move dashboard scuemata to grafana-schema (#38470)

* Relocate dashboard scuemata to grafana-schema

* Update assorted tests, vars with dashboard path

* Remove crufty commented var

* Not sure...why that failed

* Remove prefix from base dashboard path var

* Move cue/ui remnants into grafana-schema

* Update import paths in plugin models

* Remove mudball, add package statements

* Remove cuegen.sh

Wooooo we ain't got no codegen

* Revert "Remove mudball, add package statements"

This reverts commit 9bed3098f1.

* Tidy up all the cue files

* Move dashboard scuemata into scuemata/ subdir

Co-authored-by: Ryan McKinley <ryantxu@gmail.com>

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

@@ -28,11 +28,11 @@ func TestValidateScuemataBasics(t *testing.T) {
 	})
 
 	t.Run("Testing scuemata validity with invalid cue schemas - family missing", func(t *testing.T) {
-		genCue, err := os.ReadFile("testdata/missing_family_gen.cue")
+		genCue, err := os.ReadFile("testdata/missing_family.cue")
 		require.NoError(t, err)
 
 		filesystem := fstest.MapFS{
-			"cue/data/gen.cue": &fstest.MapFile{Data: genCue},
+			"packages/grafana-schema/src/scuemata/dashboard/dashboard.cue": &fstest.MapFile{Data: genCue},
 		}
 		mergedFS := mergefs.Merge(filesystem, defaultBaseLoadPaths.BaseCueFS)
 
@@ -46,11 +46,11 @@ func TestValidateScuemataBasics(t *testing.T) {
 	})
 
 	t.Run("Testing scuemata validity with invalid cue schemas - panel missing ", func(t *testing.T) {
-		genCue, err := os.ReadFile("testdata/missing_panel_gen.cue")
+		genCue, err := os.ReadFile("testdata/missing_panel.cue")
 		require.NoError(t, err)
 
 		filesystem := fstest.MapFS{
-			"cue/data/gen.cue": &fstest.MapFile{Data: genCue},
+			"packages/grafana-schema/src/scuemata/dashboard/dashboard.cue": &fstest.MapFile{Data: genCue},
 		}
 		mergedFS := mergefs.Merge(filesystem, defaultBaseLoadPaths.BaseCueFS)