[Docs] Add documentation explaining how the bots work

[ZainRizvi]

Two motivations behind adding this:

1. Make it easier for other contributors to update bots (as we'd like to encourage others to directly update these for their use cases instead of asking the Dev Infra team to support all repos)
2. Make it easier to use LLMs with these

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Project	Deployment	Preview	Updated (UTC)
torchci	Ready	Preview	Sep 19, 2025 10:27pm

[clee2000]

I like the middle section for "detailed bot analysis", but I feel like there is unusual emphasis on certain things in the other parts and some of the headings/groups are odd. Some things I found odd are

• why are the command parser and command handler entrypoints?
• are Constants.ts and subscriptions.ts really configuration files?
• things in Key Features feel like they should either be in bot analysis or the core architecture

Some things that I noticed that I don't think are correct

• Uses ML/analytics data from ClickHouse to make intelligent retry decisions
• **Monitoring**: DynamoDB logging + external Dr. CI dashboard
• nit CI flow should probably be ciflow if only for consistency with other comments in the codebase

Then again, we don't really use correct or consistent terminology either when referring to most of these so idk

Not related to this PR but there are probably a bunch of bots we can get rid of (edit: #7195)

[zxiiro]

Thanks for documenting this. I did not realize there were so many bots!