[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>

controllers/server.go

@@ -25,7 +25,6 @@ func serverHandlers(r *mux.Router) {
 	r.HandleFunc("/api/server/usage", Authorize(true, false, "user", http.HandlerFunc(getUsage))).Methods(http.MethodGet)
 }
 
-// TODO move to EE package? there is a function and a type there for that already
 func getUsage(w http.ResponseWriter, r *http.Request) {
 	type usage struct {
 		Hosts     int `json:"hosts"`
@@ -164,9 +163,9 @@ func getConfig(w http.ResponseWriter, r *http.Request) {
 	// get params
 
 	scfg := servercfg.GetServerConfig()
-	scfg.IsEE = "no"
-	if servercfg.Is_EE {
-		scfg.IsEE = "yes"
+	scfg.IsPro = "no"
+	if servercfg.IsPro {
+		scfg.IsPro = "yes"
 	}
 	json.NewEncoder(w).Encode(scfg)
 	//w.WriteHeader(http.StatusOK)