Dbradish add cosmos DB sample links

[dbradish-microsoft]

---

This checklist is used to make sure that common guidelines for a pull request are followed.

Related command

General Guidelines

• [ ] Have you run azdev style <YOUR_EXT> locally? (pip install azdev required)
• [ ] Have you run python scripts/ci/test_index.py -q locally?

For new extensions:

• [ ] My extension description/summary conforms to the Extension Summary Guidelines.

About Extension Publish

There is a pipeline to automatically build, upload and publish extension wheels.
Once your pull request is merged into main branch, a new pull request will be created to update src/index.json automatically.
The precondition is to put your code inside this repository and upgrade the version in the pull request but do not modify src/index.json.

[dbradish-microsoft]

#sign-off on link accuracy.

@kairu-ms , please confirm that I have put the long-summary property in the right place.

[yonzhan]

Add @evelyn-ys for awareness

[dbradish-microsoft]

This task was completed in PR https://github.com/Azure/azure-cli-extensions/pull/4854/files