badwords: dedupe invocation into a runnable script

Also:
- GHA/checksrc: merge two badwords CI jobs into a single one.
- re-add the more common bitness entries.

Closes #20874

.github/workflows/checksrc.yml

@@ -179,6 +179,4 @@ jobs:
         run: .github/scripts/yamlcheck.sh
 
       - name: 'badwords'
-        run: |
-          # we allow some extra in source code
-          grep -Ev '^(will:|But=|So=|And=| url=)' ./scripts/badwords.txt | ./scripts/badwords -a src lib include docs/examples
+        run: scripts/badwords-all