Rollup merge of #144583 - apiraino:enable-t-compiler-backport-nomination, r=jieyouxu,Urgau

Enable T-compiler backport nomination

This patches the triagebot.toml so that it will trigger a backport label on pull requests fixing regressions. Applying a backport label will trigger creating a Zulip thread. For now the configuration only for `T-compiler` labeled regressions.

Comments in the code explain how it works. Documentation [on the forge](https://forge.rust-lang.org/triagebot/backport.html).

```
[backport.foo]

# The pull request MUST have one of these labels
required_pr_labels = ["T-compiler"]

# The regression MUST have this label
required_issue_label = "regression-from-stable-to-beta"

# if the above conditions matches, the PR will receive these labels
add_labels = ["beta-nominated"]
```

Anything to think about before merging this?

thanks for a review

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