[NET-546] Move ee code to ee package, unify ee status and terminology (#2538)

* Move ee code to ee package and unify ee status to IsPro

* Consolidate naming for paid/professional/enterprise version as "pro". Notes:

- Changes image tags
- Changes build tags
- Changes package names
- Doesn't change links to docs that mention "ee"
- Doesn't change parameters sent to PostHog that mention "ee"

* Revert docker image tag being -pro, back to -ee

* Revert go build tag being pro, back to ee

* Add build tags for some ee content

* [2] Revert go build tag being pro, back to ee

* Fix test workflow

* Add a json tag to be backwards compatible with frontend "IsEE" check

* Add a json tag for the serverconfig struct for IsEE

* Ammend json tag to Is_EE

* fix ee tags

---------

Co-authored-by: Abhishek Kondur <abhi281342@gmail.com>

pro/controllers/middleware.go

@@ -0,0 +1,17 @@
+package controllers
+
+import (
+	"github.com/gravitl/netmaker/logic"
+	"github.com/gravitl/netmaker/servercfg"
+	"net/http"
+)
+
+func OnlyServerAPIWhenUnlicensedMiddleware(handler http.Handler) http.Handler {
+	return http.HandlerFunc(func(writer http.ResponseWriter, request *http.Request) {
+		if servercfg.ErrLicenseValidation != nil && request.URL.Path != "/api/server/status" {
+			logic.ReturnErrorResponse(writer, request, logic.FormatError(servercfg.ErrLicenseValidation, "forbidden"))
+			return
+		}
+		handler.ServeHTTP(writer, request)
+	})
+}