fix(software): paginate host software pages by distinct title IDs

[SergioChan]

Related issue: Resolves #41277

Summary

• paginate ListHostSoftware using a distinct title-id query first, then fetch/hydrate rows only for that page of title IDs
• preserve page ordering by applying ORDER BY FIELD(id, ...) when loading detailed rows for dedup/hydration
• extend testListHostSoftwarePaginationWithMultipleInstallers to verify page 1 contains a full page with no overlap against page 0

Testing

• Added/updated automated tests
• Where appropriate, automated tests simulate multiple hosts and test for host isolation
• QA'd all new/changed functionality manually

Validation run in this environment:

• go test ./server/datastore/mysql -run TestDatastoreReplica -count=1

Note: the ListHostSoftwarePaginationWithMultipleInstallers integration-style datastore test was updated but not executable in this runtime because the required datastore integration harness (seeded MySQL test setup) is not active in this isolated run.

[codecov]

Codecov Report

❌ Patch coverage is 28.12500% with 23 lines in your changes missing coverage. Please review.
✅ Project coverage is 65.98%. Comparing base (fc5f249) to head (b47b4fc).
⚠️ Report is 16 commits behind head on main.

Files with missing lines	Patch %	Lines
server/datastore/mysql/software.go	28.12%	23 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #41351      +/-   ##
==========================================
- Coverage   66.36%   65.98%   -0.39%     
==========================================
  Files        2477     2477              
  Lines      198496   198527      +31     
  Branches     8891     8891              
==========================================
- Hits       131729   130995     -734     
- Misses      54865    55624     +759     
- Partials    11902    11908       +6     

Flag	Coverage Δ
backend	67.71% <28.12%> (-0.45%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[iansltx]

Already fixed in #41300. Closing.