Added GitOps support for uninstall script. (#21969)

`fleetctl gitops` subtask for #20320

# Checklist for submitter

- [x] Input data is properly validated, `SELECT *` is avoided, SQL
injection is prevented (using placeholders for values in statements)
- [x] Added/updated tests
- [x] Manual QA for all new/changed functionality

cmd/fleetctl/testdata/gitops/lib/uninstall_ruby.sh

@@ -0,0 +1 @@
+echo 'uninstall' ${PACKAGE_ID}

cmd/fleetctl/testdata/gitops/no_team_software_installer_uninstall_not_found.yml

@@ -0,0 +1,19 @@
+# Test config
+controls:
+queries:
+policies:
+agent_options:
+org_settings:
+  server_settings:
+    server_url: $FLEET_SERVER_URL
+  org_info:
+    contact_url: https://example.com/contact
+    org_logo_url: ""
+    org_logo_url_light_background: ""
+    org_name: ${ORG_NAME}
+  secrets: [{"secret":"globalSecret"}]
+software:
+  packages:
+    - url: ${SOFTWARE_INSTALLER_URL}/ruby.deb
+      uninstall_script:
+        path: lib/notfound.sh

cmd/fleetctl/testdata/gitops/no_team_software_installer_valid.yml

@@ -10,5 +10,7 @@ software:
         path: lib/query_ruby.yml
       post_install_script:
         path: lib/post_install_ruby.sh
+      uninstall_script:
+        path: lib/uninstall_ruby.sh
     - url: ${SOFTWARE_INSTALLER_URL}/other.deb
       self_service: true

cmd/fleetctl/testdata/gitops/team_config_no_paths.yml

@@ -124,5 +124,7 @@ software:
         path: lib/query_ruby.yml
       post_install_script:
         path: lib/post_install_ruby.sh
+      uninstall_script:
+        path: lib/uninstall_ruby.sh
     - url: ${SOFTWARE_INSTALLER_URL}/other.deb
       self_service: true

cmd/fleetctl/testdata/gitops/team_software_installer_uninstall_not_found.yml

@@ -0,0 +1,19 @@
+name: "${TEST_TEAM_NAME}"
+team_settings:
+  secrets:
+    - secret: "ABC"
+  features:
+    enable_host_users: true
+    enable_software_inventory: true
+  host_expiry_settings:
+    host_expiry_enabled: true
+    host_expiry_window: 30
+agent_options:
+controls:
+policies:
+queries:
+software:
+  packages:
+    - url: ${SOFTWARE_INSTALLER_URL}/ruby.deb
+      uninstall_script:
+        path: lib/notfound.sh

cmd/fleetctl/testdata/gitops/team_software_installer_valid.yml

@@ -21,5 +21,7 @@ software:
         path: lib/query_ruby.yml
       post_install_script:
         path: lib/post_install_ruby.sh
+      uninstall_script:
+        path: lib/uninstall_ruby.sh
     - url: ${SOFTWARE_INSTALLER_URL}/other.deb
       self_service: true