Default to python3 on Debian 10 (#63097)

lib/ansible/config/base.yml

@@ -1458,6 +1458,8 @@ INTERPRETER_PYTHON_DISTRO_MAP:
     centos: &rhelish
       '6': /usr/bin/python
       '8': /usr/libexec/platform-python
+    debian:
+      '10': /usr/bin/python3
     fedora:
       '23': /usr/bin/python3
     redhat: *rhelish

test/integration/targets/interpreter_discovery_python/tasks/main.yml

@@ -111,6 +111,12 @@
       - ansible_facts['ansible_bogus_interpreter'] | default('nope') == 'nope'
       - ansible_facts['discovered_interpreter_bogus'] | default('nope') == 'nope'
 
+  - name: debian assertions
+    assert:
+      that:
+      - auto_out.ansible_facts.discovered_interpreter_python == '/usr/bin/python3'
+    when: distro == 'debian' and distro_version is version('10', '>=')
+
   - name: fedora assertions
     assert:
       that: