Pacman: Fix name of URL packages (#4959)

* Strip downloading... of unseen URLs

* Added changelog fragment

* Added integration tests for reason and reason_for

Inspired by the integration tests for url packages

* Revert "Added integration tests for reason and reason_for"

This reverts commit f60d92f.

Accidentally commited to the wrong branch.

(cherry picked from commit 788cfb6)

changelogs/fragments/4959-pacman-fix-url-packages-name.yaml

@@ -0,0 +1,2 @@
+bugfixes:
+  - pacman - fixed name resolution of URL packages (https://github.com/ansible-collections/community.general/pull/4959).

plugins/modules/packaging/os/pacman.py

@@ -613,8 +613,9 @@ def package_list(self):
                                 stderr=stderr,
                                 rc=rc,
                             )
-                    # With Pacman v6.0.1 - libalpm v13.0.1, --upgrade outputs "loading packages..." on stdout. strip that
-                    stdout = stdout.replace("loading packages...\n", "")
+                    # With Pacman v6.0.1 - libalpm v13.0.1, --upgrade outputs " filename_without_extension downloading..." if the URL is unseen.
+                    # In all cases, pacman outputs "loading packages..." on stdout. strip both
+                    stdout = stdout.splitlines()[-1]
                     is_URL = True
                 pkg_name = stdout.strip()
                 pkg_list.append(Package(name=pkg_name, source=pkg, source_is_URL=is_URL))