AccessControl: frontend changes for adding FGAC to licensing (#39484)

* refactor licenseURL function to use context and export permission evaluation fction

* remove provisioning file

* refactor licenseURL to take in a bool to avoid circular dependencies

* remove function for appending nav link, as it was only used once and move the function to create admin node

* better argument names

* create a function for permission checking

* extend permission checking when displaying server stats

* enable the use of enterprise access control actions when evaluating permissions

* import ordering

* move licensing FGAC action definitions to models package to allow access from oss

* move evaluatePermissions for routes to context serve

* change permission evaluator to take in more permissions

* move licensing FGAC actions again to appease wire

* avoid index out of bounds issue in case no children are passed in when creating server admin node

* simplify syntax for permission checking

Co-authored-by: Alex Khomenko <Clarity-89@users.noreply.github.com>

* update loading state for server stats

* linting

* more linting

* fix test

* fix a frontend test

* update "licensing.reports:read" action naming

* UI doesn't allow reading only licensing reports and not the rest of licensing info

Co-authored-by: Alex Khomenko <Clarity-89@users.noreply.github.com>

pkg/services/accesscontrol/models.go

@@ -197,8 +197,20 @@ const (
 
 	// Settings scope
 	ScopeSettingsAll = "settings:*"
+
+	// Licensing related actions
+	ActionLicensingRead        = "licensing:read"
+	ActionLicensingUpdate      = "licensing:update"
+	ActionLicensingDelete      = "licensing:delete"
+	ActionLicensingReportsRead = "licensing.reports:read"
 )
 
 const RoleGrafanaAdmin = "Grafana Admin"
 
 const FixedRolePrefix = "fixed:"
+
+// LicensingPageReaderAccess defines permissions that grant access to the licensing and stats page
+var LicensingPageReaderAccess = EvalAny(
+	EvalPermission(ActionLicensingRead),
+	EvalPermission(ActionServerStatsRead),
+)