Contributing Fleet-maintained apps (#35235)

- Simplify steps. Why? Fewer handoffs / approvals
- #g-software EM reviews all PRs within 3 business days
- Commit to automated tests. No need to do manual testing because the CI
already installs the app and checks, via osquery, if the
install/uninstalls worked
- Remove issue template

Why now?
- https://github.com/fleetdm/confidential/issues/12844

---------

Co-authored-by: Martin Angers <martin.n.angers@gmail.com>
Co-authored-by: George Karr <georgekarrv@users.noreply.github.com>

.github/ISSUE_TEMPLATE/fma-request.md

@@ -1,37 +0,0 @@
----
-name: 📦 New Fleet-maintained app
-about: Request to add an app to the Fleet-maintained app catalog
-title: 'New FMA: <App Name>'
-labels: ':release,#g-software,fma'
-assignees: 'marko-lisica'
-
----
-
-### Requestor
-
-- Application name: TODO
-- Application platform: TODO (macOS/Windows)
-
----
-
-### Validation
-
-- [ ] The following outputs are generated
-        - `/outputs/<app-name>/darwin.json` created
-        - `/outputs/apps.json` updated
-- [ ] Manifest name matches osquery `app.name` (macOS) or `programs.name` (Windows)
-- [ ] Manifest version scheme matches osquery `app.short_bundle_version` (macOS) or `programs.version` (Windows) version scheme
-- [ ] Manifest `unique_identifier` matches osquery `app.bundle_identifier` (macOS only)
-
-### QA
-
-- [ ] App adds successfully to team's library
-- [ ] App installs successfully on host
-- [ ] App opens successfully on host
-- [ ] App uninstalls successfully on host
-
-### Icon
-
-- [ ] Icon added to Figma
-- [ ] Icon added to Fleet
-- [ ] Correct icon appears in the app catalog