[llvm] Github Automation: Add support for an optional colon after command name (PR #66540)

[Pranav Reddy P via llvm-commits]

PranavReddyP16 wrote:

@tbaederr given https://github.com/llvm/llvm-project/pull/66781, do we still want to continue with this? Tagging since @tbaederr opened the issue for this (https://github.com/llvm/llvm-project/issues/64803)

https://github.com/llvm/llvm-project/pull/66540