[llvm] workflows: Unsplit new-prs (PR #69560)

[Aiden Grossman via llvm-commits]

boomanaiden154 wrote:

@tstellar Any chance this can get merged soon? This looks to be eliminating quite a few Github API requests per PR, which would be really good to have right now given that we're hitting the 1000 requests/hr limit.

https://github.com/llvm/llvm-project/actions/runs/6723750547

https://github.com/llvm/llvm-project/pull/69560