Plugins: Remove bundled plugins feature (#96490)

* remove bundled plugins

* Add echo to command

Co-authored-by: Andres Martinez Gotor <andres.martinez@grafana.com>

* remove folder entirely

* remove folder from CODEOWNERS

---------

Co-authored-by: Andres Martinez Gotor <andres.martinez@grafana.com>

pkg/plugins/manager/loader/loader_test.go

@@ -124,56 +124,6 @@ func TestLoader_Load(t *testing.T) {
 				},
 			},
 		},
-		{
-			name:        "Load a Bundled plugin",
-			class:       plugins.ClassBundled,
-			cfg:         &config.PluginManagementCfg{},
-			pluginPaths: []string{"../testdata/valid-v2-signature"},
-			want: []*plugins.Plugin{
-				{
-					JSONData: plugins.JSONData{
-						ID:   "test-datasource",
-						Type: plugins.TypeDataSource,
-						Name: "Test",
-						Info: plugins.Info{
-							Author: plugins.InfoLink{
-								Name: "Will Browne",
-								URL:  "https://willbrowne.com",
-							},
-							Version: "1.0.0",
-							Logos: plugins.Logos{
-								Small: "public/img/icn-datasource.svg",
-								Large: "public/img/icn-datasource.svg",
-							},
-							Description: "Test",
-						},
-						Dependencies: plugins.Dependencies{
-							GrafanaVersion: "*",
-							Plugins:        []plugins.Dependency{},
-							Extensions: plugins.ExtensionsDependencies{
-								ExposedComponents: []string{},
-							},
-						},
-						Extensions: plugins.Extensions{
-							AddedLinks:        []plugins.AddedLink{},
-							AddedComponents:   []plugins.AddedComponent{},
-							ExposedComponents: []plugins.ExposedComponent{},
-							ExtensionPoints:   []plugins.ExtensionPoint{},
-						},
-						Executable: "test",
-						Backend:    true,
-						State:      "alpha",
-					},
-					Module:        "public/plugins/test-datasource/module.js",
-					BaseURL:       "public/plugins/test-datasource",
-					FS:            mustNewStaticFSForTests(t, filepath.Join(parentDir, "testdata/valid-v2-signature/plugin/")),
-					Signature:     "valid",
-					SignatureType: plugins.SignatureTypeGrafana,
-					SignatureOrg:  "Grafana Labs",
-					Class:         plugins.ClassBundled,
-				},
-			},
-		},
 		{
 			name:        "Load plugin with symbolic links",
 			class:       plugins.ClassExternal,