[CLD-7567] Deprecate Self Serve: Second Pass (#26853)

* Deprecate Self Serve: First Pass

* Fix ci

* Fix more ci

* Remmove outdated server tests

* Fix a missed spot opening purchase modal in Self Hosted

* Fix i18n

* Clean up some more server code, fix webapp test

* Fix alignment of button

* Fix linter

* Fix i18n server side

* Deprecate in product true up

* Add back translation

* Remove client functions

* Put back client functions

* webapp deprecation

* Deprecate Self Serve: Second Pass

* Fix various pipeline issues

* Fix linter

* Fix pipelines

* Fix handlers_test.go

* Fix console.error around hostedCustomer in reducer

* PICKY LINTER PLEASE

* Fix webapp tests, various other fixes for the CI pipelines

* Fix i18n

* Updates to accomadate enterprise code removal

* Fix mocks

* More removal

* Fix

* Adjustments from PR

* Fixes for QA Feedback

* Update

* Add migrations to remove true up review history

* Fix migrations check

---------

Co-authored-by: Mattermost Build <build@mattermost.com>
Co-authored-by: maria.nunez <maria.nunez@mattermost.com>

server/channels/web/handlers.go

@@ -258,11 +258,6 @@ func (h Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	w.Header().Set("X-Content-Type-Options", "nosniff")
 	w.Header().Set("Referrer-Policy", "no-referrer")
 
-	cloudCSP := ""
-	if c.App.Channels().License().IsCloud() || *c.App.Config().ServiceSettings.SelfHostedPurchase {
-		cloudCSP = " js.stripe.com/v3"
-	}
-
 	if h.IsStatic {
 		// Instruct the browser not to display us in an iframe unless is the same origin for anti-clickjacking
 		w.Header().Set("X-Frame-Options", "SAMEORIGIN")
@@ -271,9 +266,8 @@ func (h Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 
 		// Set content security policy. This is also specified in the root.html of the webapp in a meta tag.
 		w.Header().Set("Content-Security-Policy", fmt.Sprintf(
-			"frame-ancestors %s; script-src 'self' cdn.rudderlabs.com%s%s%s",
+			"frame-ancestors %s; script-src 'self' cdn.rudderlabs.com%s%s",
 			frameAncestors,
-			cloudCSP,
 			h.cspShaDirective,
 			devCSP,
 		))