feat(docs): add devsite-help and snippets for Retries, Update Masks, and OCC for IAM

[bshaffer]

I followed the examples of other pages in docs/devsite-help, but it's quite possible I'm missing a critical aspect. I also am not sure how these will be tested.

I ran all samples locally to verify they worked but please take a look and review

1. Docs content
2. Sample code
3. How I've connected things up

[gemini-code-assist[bot]]

Summary of Changes

Hello @bshaffer, I'm Gemini Code Assist[^1]! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances the documentation for Google Cloud .NET client libraries by introducing three new guides focused on advanced usage patterns. These guides cover Optimistic Concurrency Control for IAM policies, flexible retry and timeout configurations, and efficient partial resource updates using update masks. Each guide is complemented by practical C# code snippets, providing developers with clear instructions and examples to implement these critical features effectively.

Highlights

• New Documentation Pages: Added comprehensive guides for Optimistic Concurrency Control (OCC) for IAM, configuring Retries and Timeouts, and utilizing Update Masks.
• C# Code Snippets: Introduced corresponding C# code examples to illustrate the practical application of OCC, retry mechanisms, and update masks within Google Cloud .NET client libraries.
• Table of Contents Integration: Updated the docs/devsite-help/toc.yml file to ensure the new documentation pages are discoverable and properly linked within the documentation structure.

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[github-actions[bot]]

Pull request diff results No APIs have changed in this PR. Exiting diff.

[github-actions[bot]]

Pull request diff results No APIs have changed in this PR. Exiting diff.