[llvm] ci: Fix `pr-code-format` permissions for private forks (PR #120838)

[Tom Stellard via llvm-commits]

tstellar wrote:

This workflow should not be adding comments to the pull requests directly.  The comments are added by this workflow instead: https://github.com/llvm/llvm-project/blob/main/.github/workflows/issue-write.yml

So, I don't think it needs these permissions.  Can you show me what failures you are seeing?


https://github.com/llvm/llvm-project/pull/120838