Optimize software/versions queries. (#35670)

[getvictor]

Related issue: Resolves #34677 and Resolves #35349

Loadtest results:

Description               Average  Worst    Results
-----------               -------  -----    -------
Page 0, DESC order        441ms    506ms    20 items
Page 0, ASC order         1.099s   1.8s     20 items
Page 1000, DESC order     484ms    641ms    20 items
100 per_page              426ms    450ms    100 items
With CVE scores           467ms    630ms    20 items
Order by name, page 0     7.589s   7.812s   20 items
Order by name, page 1000  9.103s   9.656s   20 items
Vulnerable only           6.098s   6.34s    20 items
Search 'chrome'           14.305s  14.868s  20 items
Known exploit filter      20.253s  21.238s  20 items
Min CVSS score 7.0        33.743s  35.169s  20 items
Max CVSS score 8.0        39.825s  41.83s   20 items
CVSS range 7.0-9.0        42.556s  43.267s  20 items

Follow-up issue: #35799

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.

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

Database migrations

• Checked schema for all modified table for columns that will auto-update timestamps during migration.

Summary by CodeRabbit

• Refactor
• Improved software listing and counting performance via database index and query optimizations, resulting in faster retrieval and reduced load times for software lists across team and global views.
• Chores
• Added a migration to apply the index changes and updated migration tracking.

(cherry picked from commit 3724166)

[codecov]

Codecov Report

❌ Patch coverage is 86.63366% with 27 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (rc-minor-fleet-v4.77.0@c2876ac). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
server/datastore/mysql/software.go	88.39%	19 Missing and 2 partials ⚠️
.../20251117020000_OptimizeSoftwareHostCountsIndex.go	66.66%	4 Missing and 2 partials ⚠️

Additional details and impacted files

@@                    Coverage Diff                    @@
##             rc-minor-fleet-v4.77.0   #36354   +/-   ##
=========================================================
  Coverage                          ?   66.16%           
=========================================================
  Files                             ?     2088           
  Lines                             ?   177827           
  Branches                          ?     7372           
=========================================================
  Hits                              ?   117664           
  Misses                            ?    49332           
  Partials                          ?    10831           

Flag	Coverage Δ
backend	67.88% <86.63%> (?)
frontend	53.52% <ø> (?)

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