Improve memory usage of software installers parsing

[mna]

#20595

Checklist for submitter

• 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)
• Added/updated tests
• Manual QA for all new/changed functionality (smoke-tested adding/editing installers, and via fleetctl)

[codecov]

Codecov Report

Attention: Patch coverage is 60.14493% with 55 lines in your changes missing coverage. Please review.

Project coverage is 63.13%. Comparing base (eff1041) to head (22190b8).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
server/fleet/software_installer.go	50.00%	14 Missing and 6 partials ⚠️
server/service/software_installers.go	26.66%	10 Missing and 1 partial ⚠️
ee/server/service/software_installers.go	79.16%	3 Missing and 2 partials ⚠️
pkg/file/file.go	60.00%	3 Missing and 1 partial ⚠️
pkg/file/xar.go	66.66%	2 Missing and 2 partials ⚠️
...md/osquery-perf/installer_cache/installer-cache.go	0.00%	3 Missing ⚠️
ee/server/service/maintained_apps.go	57.14%	2 Missing and 1 partial ⚠️
pkg/file/msi.go	76.92%	1 Missing and 2 partials ⚠️
pkg/file/pe.go	71.42%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #23596      +/-   ##
==========================================
- Coverage   63.14%   63.13%   -0.01%     
==========================================
  Files        1557     1557              
  Lines      147617   147690      +73     
  Branches     3687     3703      +16     
==========================================
+ Hits        93210    93246      +36     
- Misses      47036    47063      +27     
- Partials     7371     7381      +10     

Flag	Coverage Δ
backend	63.99% <60.14%> (-0.01%)	⬇️

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[jahzielv]

lgtm! thanks for adding the benchmark test!