Update csharp-sdk repo access to use team assignments (#76)

* Add csharp-sdk-admin team and split csharp-sdk repo permissions

Introduce a csharp-sdk-admin team for admin access to the csharp-sdk repo,
while the existing csharp-sdk team is changed to push (write) access. This
separates admin privileges from general write access.

- Add CSHARP_SDK_ADMIN role to roleIds.ts and roles.ts
- Update repoAccess.ts: csharp-sdk-admin (admin), csharp-sdk (push), PederHP (triage)
- Add jeffhandley, ericstj, jozkee, tarekgh as new members in users.ts
- Move dend/localden from csharp-sdk to csharp-sdk-admin team
- Add csharp-sdk-admin membership for halter73, mikekistler, stephentoub
- Remove MackinnonBuck (admin) direct access per request

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Fix alphabetical ordering of new users in users.ts

Move ericstj after erain and jeffhandley before jenn-newton to satisfy
the case-insensitive alphabetical sort check in validate-config.ts.

🏠 Remote-Dev: homespace

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Den Delimarsky <den@anthropic.com>

src/config/roleIds.ts

@@ -29,6 +29,7 @@ export const ROLE_IDS = {
   // ===================
   SDK_MAINTAINERS: 'sdk-maintainers',
   CSHARP_SDK: 'csharp-sdk',
+  CSHARP_SDK_ADMIN: 'csharp-sdk-admin',
   GO_SDK: 'go-sdk',
   JAVA_SDK: 'java-sdk',
   KOTLIN_SDK: 'kotlin-sdk',