feat: Apple App Store (VPP) apps (#20643)

> Related issue: #18867

# Checklist for submitter

If some of the following don't apply, delete the relevant line.

<!-- Note that API documentation changes are now addressed by the
product design team. -->

- [x] Changes file added for user-visible changes in `changes/`,
`orbit/changes/` or `ee/fleetd-chrome/changes`.
See [Changes
files](https://fleetdm.com/docs/contributing/committing-changes#changes-files)
for more information.
- [x] Input data is properly validated, `SELECT *` is avoided, SQL
injection is prevented (using placeholders for values in statements)
- [x] Added/updated tests
- [x] If database migrations are included, checked table schema to
confirm autoupdate
- [x] Manual QA for all new/changed functionality

changes/19864-vpp-token-crud

@@ -0,0 +1,2 @@
+- Adds the functionality for the `POST /mdm/apple/vpp_token`, `DELETE /mdm/apple/vpp_token` and 
+`GET /vpp` endpoints.

changes/19865-db-schema

@@ -0,0 +1 @@
+- Adds DB updates to support the VPP software feature.

changes/19867-get-avail-apps

@@ -0,0 +1 @@
+- Adds functionality for the `GET /software/app_store_apps` and `POST /software/app_store_apps` endpoints.

changes/19868-vpp-install-command

@@ -0,0 +1 @@
+- Adds functionality for installing App Store apps to the VPP feature.

changes/19870-vpp-activities-backend

@@ -0,0 +1 @@
+- Adds global activity support for VPP related activities.

changes/19871-gitops-vpp-config

@@ -0,0 +1 @@
+* Add support for VPP to gitops config

changes/19880-include-vpp-apps-in-software-titles-endpoints

@@ -0,0 +1,2 @@
+* Added the associated VPP apps to the `GET /software/titles` and `GET /software/titles/:id` endpoints.
+* Added the associated VPP apps to the `GET /hosts/:id/software` and `GET /device/:token/software` endpoints.

changes/20278-vpp-batch-api

@@ -0,0 +1 @@
+- GitOps supports VPP app associations

changes/20515-delete-vpp-app

@@ -0,0 +1,2 @@
+* Added support to delete a VPP app from a team in `DELETE /software/titles/:software_title_id/available_for_install`.
+* Fixed path that was incorrect for the download software installer package endpoint `GET /software/titles/:software_title_id/package`.

changes/issue-19866-add-remove-disable-vpp-in-ui

@@ -0,0 +1 @@
+- add ability to add/remove/disable vpp in the fleet UI.

changes/issue-19869-vpp-ui-on-software-pages

@@ -0,0 +1 @@
+- add UI to support the apple vpp feature on the software pages.

changes/issue-20612-ui-updates-host-software-device-user-pages-for-vpp

@@ -0,0 +1 @@
+- add UI updates for VPP feature on host software and my device pages.

cmd/fleetctl/get_test.go

@@ -692,10 +692,10 @@ func TestGetSoftwareTitles(t *testing.T) {
 apiVersion: "1"
 kind: software_title
 spec:
-- hosts_count: 2
+- app_store_app: null
+  hosts_count: 2
   id: 0
   name: foo
-  self_service: false
   software_package: null
   source: chrome_extensions
   versions:
@@ -713,10 +713,10 @@ spec:
     vulnerabilities:
     - cve-123-456-003
   versions_count: 3
-- hosts_count: 0
+- app_store_app: null
+  hosts_count: 0
   id: 0
   name: bar
-  self_service: false
   software_package: null
   source: deb_packages
   versions:
@@ -761,8 +761,8 @@ spec:
           ]
         }
       ],
-      "self_service": false,
-	  "software_package": null
+      "software_package": null,
+      "app_store_app": null
     },
     {
       "id": 0,
@@ -774,11 +774,11 @@ spec:
         {
           "id": 0,
           "version": "0.0.3",
-		  "vulnerabilities": null
+      "vulnerabilities": null
         }
       ],
-      "self_service": false,
-	  "software_package": null
+      "software_package": null,
+      "app_store_app": null
     }
   ]
 }