[Enterprise] Consolidate extensions folders and keep them around (#98486)

* WIP: copy approach

* Fix package name

* Do not ignore .keep for frontend extensions

* Add keep file for frontend extensions

* Tweak makefile to generate enterprise swagger or not

* Remove duplicate imports

* Add build extensions

* Add CMD extensions

* Add keep to e2e extensions

* Add .keep

* Reduce file structure changes

* Ignore boring crypto

* Add e2e extensions keep file

* Remove enterprise file

* Update .gitignore

* Move things around

* Update git ignore

* Consolidate backend extensions folder

* Move enterprise deps

* Update comment

* Do not use build tags

* Ignore setting enterprise

* Revert changes in makefile

* Revert package changes

* Add back extensions main.go

* Update git ignore

* Ignore spanner tests

* Trick ignore files only by git

* Add .ignore file to CODEOWNERS for frontend-ops

* Fix issue with noisy duplicate targets

pkg/build/cmd/main.go

@@ -5,6 +5,7 @@ import (
 	"os"
 
 	"github.com/grafana/grafana/pkg/build"
+	"github.com/grafana/grafana/pkg/build/cmd/util"
 	"github.com/urfave/cli/v2"
 )
 
@@ -66,7 +67,7 @@ func main() {
 			Name:      "publish-metrics",
 			Usage:     "Publish a set of metrics from stdin",
 			ArgsUsage: "<api-key>",
-			Action:    MaxArgCountWrapper(1, PublishMetrics),
+			Action:    util.MaxArgCountWrapper(1, PublishMetrics),
 		},
 		{
 			Name:   "verify-drone",
@@ -178,7 +179,7 @@ func main() {
 							Name:      "fetch",
 							Usage:     "Fetch Grafana Docker images",
 							ArgsUsage: "[version]",
-							Action:    MaxArgCountWrapper(1, FetchImages),
+							Action:    util.MaxArgCountWrapper(1, FetchImages),
 							Flags: []cli.Flag{
 								&editionFlag,
 							},
@@ -229,7 +230,7 @@ func main() {
 					Flags: []cli.Flag{
 						&editionFlag,
 						&buildIDFlag,
-						&dryRunFlag,
+						&util.DryRunFlag,
 						&cli.StringFlag{
 							Name:  "src-bucket",
 							Value: "grafana-downloads",
@@ -242,7 +243,7 @@ func main() {
 					Usage:  "Publish packages to GitHub releases",
 					Action: PublishGithub,
 					Flags: []cli.Flag{
-						&dryRunFlag,
+						&util.DryRunFlag,
 						&cli.StringFlag{
 							Name:  "path",
 							Usage: "Path to the asset to be published",
@@ -267,7 +268,7 @@ func main() {
 					Usage:  "Publish image to AWS Marketplace releases",
 					Action: PublishAwsMarketplace,
 					Flags: []cli.Flag{
-						&dryRunFlag,
+						&util.DryRunFlag,
 						&cli.StringFlag{
 							Name:  "version",
 							Usage: "Release version (default from metadata)",