simplify changeset & update hasFile to accept number or string

Signed-off-by: Claire Peng <clairep@spotify.com>

.changeset/twelve-oranges-grin.md

@@ -6,15 +6,6 @@ Update GitlabDiscoveryEntityProvider to use `project.id` rather than `project.pa
 
 Solves [#30147](https://github.com/backstage/backstage/issues/30147):
 
-> Use of project.id avoids edgecases caused by path encoding or project structure changes
+> Use of project.id avoids edge cases caused by path encoding or project structure changes
 > [...]
 > It also simplifies reasoning about the GitLab API usage, since IDs are immutable, while paths are not.
-
-```diff
-const hasFile = await client.hasFile(
--    project.path_with_namespace,
-+    project.id.toString(),
-    project_branch,
-    this.config.catalogFile,
-);
-```

plugins/catalog-backend-module-gitlab/src/lib/client.ts

@@ -349,7 +349,7 @@ export class GitLabClient {
    * @param filePath - The path to the file
    */
   async hasFile(
-    projectIdentifier: string,
+    projectIdentifier: string | number,
     branch: string,
     filePath: string,
   ): Promise<boolean> {

plugins/catalog-backend-module-gitlab/src/providers/GitlabDiscoveryEntityProvider.ts

@@ -590,7 +590,7 @@ export class GitlabDiscoveryEntityProvider implements EntityProvider {
       this.config.fallbackBranch;
 
     const hasFile = await client.hasFile(
-      project.id.toString(),
+      project.id,
       project_branch,
       this.config.catalogFile,
     );