Remove in-product pricing modal (#31187)

* Remove pricing modal. Adjust everywhere to instead open mattermost.com/pricing. When air gapped, don't show buttons to view plans.

* Fix lint

* Further clean up of unused code. Fixes for linter

* fixes for PR feedback

* useExternalLink for opening pricing modal with enriched params

* Fix i17n

* Fix style, tests

server/channels/api4/cloud.go

@@ -22,8 +22,6 @@ func (api *API) InitCloud() {
 	// GET /api/v4/cloud/limits
 	api.BaseRoutes.Cloud.Handle("/limits", api.APISessionRequired(getCloudLimits)).Methods(http.MethodGet)
 
-	api.BaseRoutes.Cloud.Handle("/products/selfhosted", api.APISessionRequired(getSelfHostedProducts)).Methods(http.MethodGet)
-
 	// GET /api/v4/cloud/customer
 	// PUT /api/v4/cloud/customer
 	// PUT /api/v4/cloud/customer/address
@@ -212,45 +210,6 @@ func validateWorkspaceBusinessEmail(c *Context, w http.ResponseWriter, r *http.R
 	}
 }
 
-func getSelfHostedProducts(c *Context, w http.ResponseWriter, r *http.Request) {
-	ensured := ensureCloudInterface(c, "Api4.getSelfHostedProducts")
-	if !ensured {
-		return
-	}
-
-	products, err := c.App.Cloud().GetSelfHostedProducts(c.AppContext.Session().UserId)
-	if err != nil {
-		c.Err = model.NewAppError("Api4.getSelfHostedProducts", "api.cloud.request_error", nil, "", http.StatusInternalServerError).Wrap(err)
-		return
-	}
-
-	byteProductsData, err := json.Marshal(products)
-	if err != nil {
-		c.Err = model.NewAppError("Api4.getSelfHostedProducts", "api.cloud.app_error", nil, "", http.StatusInternalServerError).Wrap(err)
-		return
-	}
-
-	if !c.App.SessionHasPermissionTo(*c.AppContext.Session(), model.PermissionSysconsoleReadBilling) {
-		sanitizedProducts := []model.UserFacingProduct{}
-		err = json.Unmarshal(byteProductsData, &sanitizedProducts)
-		if err != nil || sanitizedProducts == nil {
-			c.Err = model.NewAppError("Api4.getSelfHostedProducts", "api.cloud.app_error", nil, "", http.StatusInternalServerError).Wrap(err)
-			return
-		}
-
-		byteSanitizedProductsData, err := json.Marshal(sanitizedProducts)
-		if err != nil {
-			c.Err = model.NewAppError("Api4.getSelfHostedProducts", "api.cloud.app_error", nil, "", http.StatusInternalServerError).Wrap(err)
-			return
-		}
-
-		w.Write(byteSanitizedProductsData)
-		return
-	}
-
-	w.Write(byteProductsData)
-}
-
 func getCloudProducts(c *Context, w http.ResponseWriter, r *http.Request) {
 	ensured := ensureCloudInterface(c, "Api4.getCloudProducts")
 	if !ensured {