IHA: serve manifest and .ipa file from Fleet server

[jahzielv]

Fixes #33039

Checklist for submitter

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

Testing

• Added/updated automated tests

• QA'd all new/changed functionality manually

[codecov]

Codecov Report

❌ Patch coverage is 8.78378% with 135 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (feat-in-house-apps@9f5c4a7). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
ee/server/service/software_installers.go	0.00%	80 Missing ⚠️
server/service/software_installers.go	0.00%	55 Missing ⚠️

Additional details and impacted files

@@                  Coverage Diff                  @@
##             feat-in-house-apps   #34095   +/-   ##
=====================================================
  Coverage                      ?   63.70%           
=====================================================
  Files                         ?     1879           
  Lines                         ?   186136           
  Branches                      ?     6863           
=====================================================
  Hits                          ?   118570           
  Misses                        ?    57884           
  Partials                      ?     9682           

Flag	Coverage Δ
backend	64.87% <8.78%> (?)

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