[ci] Remove command robotpy PR responder (#8392)

This is no longer required with the merge of Python commands.

.github/workflows/command-robotpy-pr.yml

@@ -1,27 +0,0 @@
-name: Comment on PR for robotpy
-
-on:
-  pull_request_target:
-    types:
-      - opened
-    paths:
-      - 'commandsv2/src/**/*.java'
-
-jobs:
-  comment:
-    permissions:
-      pull-requests: write
-
-    runs-on: ubuntu-latest
-    steps:
-      - name: Comment on PR
-        if: github.repository == 'wpilibsuite/allwpilib'
-        uses: actions/github-script@v7
-        with:
-          script: |
-            github.rest.issues.createComment({
-                issue_number: context.issue.number,
-                owner: context.repo.owner,
-                repo: context.repo.repo,
-                body: 'This PR modifies commands. Please open a corresponding PR in [Python Commands](https://github.com/robotpy/robotpy-commands-v2/) and include a link to this PR.'
-            })