Add Spotify as macOS Fleet-maintained app

[allenhouchins]

Introduces Spotify as a maintained app for macOS, including input and output JSON definitions, install/uninstall scripts, an icon component, and the app icon image. Updates the apps.json to list Spotify with relevant metadata and description.

Related issue: Resolves #

Checklist for submitter

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

• Changes file added for user-visible changes in changes/, orbit/changes/ or ee/fleetd-chrome/changes.
  See Changes files for more information.

• Input data is properly validated, SELECT * is avoided, SQL injection is prevented (using placeholders for values in statements)

• If paths of existing endpoints are modified without backwards compatibility, checked the frontend/CLI for any necessary changes

Testing

• Added/updated automated tests

• Where appropriate, automated tests simulate multiple hosts and test for host isolation (updates to one hosts's records do not affect another)

• QA'd all new/changed functionality manually

For unreleased bug fixes in a release candidate, one of:

• Confirmed that the fix is not expected to adversely impact load test results
• Alerted the release DRI if additional load testing is needed

Database migrations

• Checked schema for all modified table for columns that will auto-update timestamps during migration.
• Confirmed that updating the timestamps is acceptable, and will not cause unwanted side effects.
• Ensured the correct collation is explicitly set for character columns (COLLATE utf8mb4_unicode_ci).

New Fleet configuration settings

• Setting(s) is/are explicitly excluded from GitOps

If you didn't check the box above, follow this checklist for GitOps-enabled settings:

• Verified that the setting is exported via fleetctl generate-gitops
• Verified the setting is documented in a separate PR to the GitOps documentation
• Verified that the setting is cleared on the server if it is not supplied in a YAML file (or that it is documented as being optional)
• Verified that any relevant UI is disabled when GitOps mode is enabled

fleetd/orbit/Fleet Desktop

• Verified compatibility with the latest released version of Fleet (see Must rule)
• If the change applies to only one platform, confirmed that runtime.GOOS is used as needed to isolate changes
• Verified that fleetd runs on macOS, Linux and Windows
• Verified auto-update works from the released version of component to the new version (see tools/tuf/test)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 66.08%. Comparing base (c1b5d18) to head (aea0f49).
⚠️ Report is 24 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #35336      +/-   ##
==========================================
- Coverage   66.23%   66.08%   -0.16%     
==========================================
  Files        2109     2089      -20     
  Lines      179221   176434    -2787     
  Branches     7442     7381      -61     
==========================================
- Hits       118712   116593    -2119     
+ Misses      49627    49160     -467     
+ Partials    10882    10681     -201     

Flag	Coverage Δ
frontend	53.63% <ø> (ø)

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[allenhouchins]

@georgekarrv & @marko-lisica this is ready for review!

[allenhouchins]

Fixed a conflict. The check is failing on an unrelated FMA. Ready for re-review.