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/setup-local-repos.yml

@@ -0,0 +1,28 @@
+---
+
+- name: create dirs
+  file:
+    name: "{{item}}"
+    state: directory
+  with_items:
+    - "{{repo_dir}}/minimal"
+    - "{{repo_dir}}/shallow"
+
+- name: prepare minimal git repo
+  shell: git init; echo "1" > a; git add a; git commit -m "1"
+  args:
+    chdir: "{{repo_dir}}/minimal"
+
+- name: prepare git repo for shallow clone
+  shell: |
+    git init;
+    echo "1" > a; git add a; git commit -m "1"; git tag earlytag; git branch earlybranch;
+    echo "2" > a; git add a; git commit -m "2";
+  args:
+    chdir: "{{repo_dir}}/shallow"
+
+- name: set old hash var for shallow test
+  command: 'git rev-parse HEAD~1'
+  register: git_shallow_head_1
+  args:
+    chdir: "{{repo_dir}}/shallow"