Make run_command() work when we get byte str with non-ascii characters (instead of unicode type like we were expecting)

Fix and test.

Fixes #10536

test/integration/unicode.yml

@@ -41,6 +41,15 @@
     - name: 'A task with unicode host vars'
       debug: var=unicode_host_var
 
+    - name: 'A task with unicode shell parameters'
+      shell: echo '¯ ° ± ² ³ ´ µ ¶ · ¸ ¹ º » ¼ ½ ¾ ¿ À Á Â Ã Ä Å Æ Ç È É Ê Ë Ì Í Î Ï Ð Ñ Ò Ó Ô Õ Ö ×'
+      register: output
+
+    - name: 'Assert that the unicode was echoed'
+      assert:
+        that:
+          - "'¯ ° ± ² ³ ´ µ ¶ · ¸ ¹ º » ¼ ½ ¾ ¿ À Á Â Ã Ä Å Æ Ç È É Ê Ë Ì Í Î Ï Ð Ñ Ò Ó Ô Õ Ö ×' in output.stdout_lines"
+
 - name: 'A play for hosts in group: ĪīĬĭ'
   hosts: 'ĪīĬĭ'
   gather_facts: true