Summary:
This PR cleans up some of our GitHub bots. The overall goal is to make the contribution process just a tad nicer.
### analysis-bot
* The bot will continue leaving GitHub Reviews when it finds lint issues, but will abstain from leaving inline comments if they would exceed 5 in number.
* The review comment left by the bot has instructions on how to reproduce the lint issues locally. This will educate PR authors on how to run lint and fix the issues without unnecessarily spamming the PR with 50+ comments, while still providing useful reviews to authors when only a handful of lint issues slip by.
* Code moved to `bots/` directory for ease of discovery and co-location with pull-bot.
* Added `yarn lint-ci` command. This seems like the right choice: it's running `yarn lint` and other linters, and it is only intended to run on CI.
* It's still possible to run `yarn lint-ci` locally, though the script will stop short of posting a review to GitHub unless the necessary envvars are provided.
* Added `yarn shellcheck` command. This can be run locally, though it requires `shellcheck` to be installed.
* Outside of this PR, I added instructions on using shellcheck to https://github.com/facebook/react-native/wiki/Development-Dependencies
* Updated Circle CI config to use these new commands, and streamlined the `analyze_pr` step.
* Documented analysis-bot in `bots/README.md`.
### pull-bot
* Bumped `danger-js` dependency. No breaking changes found in this minor bump from what I can tell.
* Documented pull-bot in `bots/README.md`.
### misc
* PR template: don't use jargon.
## Changelog
[Internal] [Changed] - GitHub Bots cleanup
Pull Request resolved: https://github.com/facebook/react-native/pull/24923
Differential Revision: D15399744
Pulled By: hramos
fbshipit-source-id: 32632e775f8554424072270e3f98542de84bfb8c
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