feat: add support for [[environments]] block

[amustaque97]

closes #2037

[github-actions]

Dry-run check results

[WARN  sync_team] sync-team is running in dry mode, no changes will be applied.
[INFO  sync_team] synchronizing github

[rustbot]

rust_team_data/src/v1.rs has been modified, it is used (as a git dependency) by multiple sub-projects like triagebot, the www.rust-lang.org website and others.

If you are changing the data structures, please make sure that the changes are not going to break serde deserialization (adding a field is fine; removing or renaming a field isn't).

If you must do a breaking change to the format, make sure to coordinate it with all the users of the rust_team_data crate.

cc @Urgau

[marcoieni]

Looks good overall. I left a few minor comments. After addressing them I will test this :)

[amustaque97]

Addressed all the review comments. Thanks for the review!
Ran a basic sanity check, and it is working locally.

[marcoieni]

The dry run worked 🥳

Can you add these environments to the toml files?

#2129 (comment)

Also you resolved this comment but you didn't address it (you should delete that note imo).

Later, you can cleanup the git history (e.g. squash all commits) and this should be ready to be merged.

[marcoieni]

Please add the comment to resolve #2127 (comment)

Also, I noticed that in the commit history there's a merge commit. Can you get rid of that by rebasing? 🙏

[marcoieni]

The dry run looks empty, which means that if we merge this there will be nothing applied. Which is what we want because it means we added all existing environments 🥳
merging this

[marcoieni]

I created #2132 as a follow up of this task if you are interested 😁