Cleanup git tests (#19737)

* Cleanup git tests
* Split git tests in seperate files
* Remove use of repo_depth_url
* Use native yaml
* Remove unnecessary remote/local clones
* Fix newlines for yamllint
* If the hash is valid (full-length) but doesn't exist, git returns 128 instead of 1.
* Ensure git doesn't use hardlinks for shallow clones

test/integration/targets/git/tasks/missing_hostkey.yml

@@ -0,0 +1,54 @@
+---
+
+- name: remove known_host files
+  file:
+    state: absent
+    path: '{{ item }}'
+  with_items: "{{known_host_files}}"
+
+- name: checkout ssh://git@github.com repo without accept_hostkey (expected fail)
+  git:
+    repo: '{{ repo_format2 }}'
+    dest: '{{ checkout_dir }}'
+  register: git_result
+  ignore_errors: true
+
+- assert:
+    that:
+      - 'git_result.failed'
+      - 'git_result.msg == "github.com has an unknown hostkey. Set accept_hostkey to True or manually add the hostkey prior to running the git module"'
+
+- name: checkout git@github.com repo with accept_hostkey (expected pass)
+  git:
+    repo: '{{ repo_format2 }}'
+    dest: '{{ checkout_dir }}'
+    accept_hostkey: true
+    key_file: '{{ github_ssh_private_key }}'
+  register: git_result
+  when: github_ssh_private_key is defined
+
+- assert:
+    that:
+      - 'git_result.changed'
+  when: not git_result|skipped
+
+
+- name: clear checkout_dir
+  file:
+    state: absent
+    path: '{{ checkout_dir }}'
+
+- name: checkout ssh://git@github.com repo with accept_hostkey (expected pass)
+  git:
+    repo: '{{ repo_format3 }}'
+    dest: '{{ checkout_dir }}'
+    version: 'master'
+    accept_hostkey: false # should already have been accepted
+    key_file: '{{ github_ssh_private_key }}'
+  register: git_result
+  when: github_ssh_private_key is defined
+
+- assert:
+    that:
+      - 'git_result.changed'
+  when: not git_result|skipped