Provisioning: Show file path of provisioning file in save/delete dialogs (#16706)

* Add file path to metadata and show it in dialogs

* Make path relative to config directory

* Fix tests

* Add test for the relative path

* Refactor to use path relative to provisioner path

* Change return types

* Rename attribute

* Small fixes from review

pkg/services/provisioning/dashboards/file_reader_linux_test.go

@@ -33,7 +33,7 @@ func TestProvsionedSymlinkedFolder(t *testing.T) {
 		t.Errorf("expected err to be nil")
 	}
 
-	resolvedPath := reader.resolvePath(reader.Path)
+	resolvedPath := reader.resolvedPath()
 	if resolvedPath != want {
 		t.Errorf("got %s want %s", resolvedPath, want)
 	}