Enable repo for Copilot

Copilot is not able to make/test updates to the specs dashboards:

```
⚠️ Warning: I tried to connect to the following addresses, but was blocked by firewall rules:

- `telemetry.astro.build.`
- Triggering Command: `node /home/REDACTED/work/typespec-azure/typespec-azure/website/node_modules/.bin/../astro/astro.js build ` (dns block)
- Triggering Command: `root process (pid 0)` (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

- Configure Actions setup steps (https://gh.io/copilot/actions-setup-steps) to set up my env before the firewall is enabled.
- Add the appropriate URLs or hosts to my firewall allow list (https://gh.io/copilot/firewall-config)
```
See https://github.com/Azure/typespec-azure/pull/3097

Start by reviewing the repository configuration and the related pull request at https://github.com/Azure/typespec-azure/pull/3097, then compare the Copilot firewall guidance in the linked documentation. Done means Copilot can update and test the specs dashboards without the telemetry.astro.build network block.

Written by the indexing model from the issue text.