Add MDM CertificateList command for host certificates feature

[gillespi314]

For #23235

Checklist for submitter

• Added/updated automated tests
• A detailed QA plan exists on the associated ticket (if it isn't there, work with the product group's QA engineer to add it)
• Manual QA for all new/changed functionality

[codecov]

Codecov Report

Attention: Patch coverage is 63.26531% with 54 lines in your changes missing coverage. Please review.

Please upload report for BASE (feat-23235-host-certificates@351f402). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
server/service/apple_mdm.go	42.85%	31 Missing and 13 partials ⚠️
pkg/mdm/mdmtest/apple.go	84.21%	2 Missing and 1 partial ⚠️
server/mdm/apple/apple_mdm.go	80.00%	2 Missing and 1 partial ⚠️
server/service/hosts.go	76.92%	2 Missing and 1 partial ⚠️
server/fleet/host_certificates.go	66.66%	1 Missing ⚠️

Additional details and impacted files

@@                       Coverage Diff                       @@
##             feat-23235-host-certificates   #26479   +/-   ##
===============================================================
  Coverage                                ?   63.83%           
===============================================================
  Files                                   ?     1657           
  Lines                                   ?   159138           
  Branches                                ?     4093           
===============================================================
  Hits                                    ?   101582           
  Misses                                  ?    49601           
  Partials                                ?     7955           

Flag	Coverage Δ
backend	64.66% <63.26%> (?)

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[getvictor]

LGTM