A `on.workflow_run.workflows` containing `+` not supported

[EnricoMi]

Describe the bug
A on.workflow_run.workflows value containing + fails with Encountered an issue parsing workflow trigger(s) "c++" in a workflow, even though such a workflow name is allowed.

To Reproduce
Steps to reproduce the behavior:

1. Create the following workflow in .github/workflows/workflow_run.yml:

name: Workflow Run Issue

on:
  workflow_run:
    workflows: ['C++']
    types:
      - completed

jobs:
  job:
    name: job
    runs-on: ubuntu-latest
    steps:
      - run: true
        shell: bash

2. Merge this to your default branch. Make sure you have another workflow that gets triggered on push event on your default branch before you push this workflow to the default branch.
3. You will see in the Actions tab an Unknown event of an Unknown workflow:
   
4. Click on that action run and you will see an annotation saying:

Encountered an issue parsing workflow trigger(s) "c++" in a workflow ".github/workflows/workflow_run.yml".

Expected behavior
The workflow_run should work with workflow names that contain +.

Runner Version and Platform

2.322.0

What's not working?

Encountered an issue parsing workflow trigger(s) "c++" in a workflow ".github/workflows/workflow_run.yml".

[EnricoMi]

The issue is that the workflows values are treated as glob patterns and special characters have to be escaped:
https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#filter-pattern-cheat-sheet
https://github.com/orgs/community/discussions/50835
github/docs#37022

In the particular case above, "C\+\+" does work.

This is not an action runner issue, will raise with Github support.