Fix ansible-test coverage --all (#62115)

changelogs/fragments/62096-test-coverage-all.yml

@@ -0,0 +1,2 @@
+bugfixes:
+- ansible-test coverage - Fix the ``--all`` argument when generating coverage reports - https://github.com/ansible/ansible/issues/62096

test/lib/ansible_test/_internal/cover.py

@@ -175,7 +175,7 @@ def _command_coverage_combine_python(args):
             updated.add_arcs({filename: list(arc_data[filename])})
 
         if args.all:
-            updated.add_arcs(dict((source, []) for source in sources))
+            updated.add_arcs(dict((source[0], []) for source in sources))
 
         if not args.explain:
             output_file = coverage_file + group