Add rfcbot to compiler-team repo

[Urgau]

Add rfcbot to the list of bots to the compiler-team reposiroty so that the bot can edit labels.

cf. https://www.github.com/rust-lang/compiler-team/issues/785#issuecomment-2544090585

[apiraino]

In triagebot#1747 (and then fixed in triagebot#1863) I have added the syntax @rfcbot concern to issue a fake command to register MCP concerns. Currently that command is a "no-op", just a device to let me keep track of MCP concerns.

I wonder what happens if the @rfcbot will be enabled for real. I guess we will discover when this PR is merged.

[Urgau]

rfcbot != rustbot (aka triagebot), I don't think there will be any issue.

[apiraino]

rfcbot != rustbot (aka triagebot), I don't think there will be any issue.

Ah ok, so that means that the invocation of @rfcbot concern¹ is handled by another codebase https://github.com/rust-lang/rfcbot-rs

Footnotes

1. looking into the issues 🤔 ↩