Revert "ci: gate coverage analysis on whether source code changed"

This reverts commit 32f9b1a231.

.github/workflows/coveralls.yml

@@ -5,20 +5,7 @@ on:
 name: Code coverage with llvm-cov
 
 jobs:
-  Prepare:
-    runs-on: ubuntu-latest
-    outputs:
-      pr_changed_source: ${{ steps.classify_pr.outputs.pr_changed_source }}
-    steps:
-      - name: Checkout Crate
-        uses: actions/checkout@v4
-      - name: Determine what files the PR changes.
-        id: classify_pr
-        run: contrib/classify-pr.sh ${{ github.event.pull_request.head.sha }} ${{ github.event.pull_request.base.sha }}
-
   Coveralls:
-    needs: Prepare
-    if: needs.Prepare.outputs.pr_changed_source == 'true'
     name: Code coverage - stable toolchain
     runs-on: ubuntu-latest
     strategy:

contrib/classify-pr.sh

@@ -16,10 +16,6 @@ git fetch origin "$pr_tip":pr_tip
 
 pr_base=$(git merge-base master_tip pr_tip)
 
-echo "Using  master $master_tip"
-echo "Using  PR tip $pr_tip"
-echo "Using PR base $pr_base"
-
 # If something modifies any non-markdown file, it's considered a source code change.
 if git diff --name-only "$pr_base" "$pr_tip" | grep -qv "^.md$"; then
     echo "pr_changed_source=true" >> "$GITHUB_OUTPUT"