Fleet UI: Host details > Software > Library skipped installs show as "Patch skipped"

[RachelElysia]

Issue

Closes #52297

Description

• Bug fix (root cause): GET /hosts/:id/software did not surface patch-when-closed skips separately from real failures, so Host details > Software > Library rendered them as "Failed". The datastore now computes skipped_install inside the install-history CTE (failed_install + empty pre_install_query_output + policy patch_when_closed=1), threads it through the resolved-installer pin / uninstall-supersede merges / assembler, and the frontend keys on the new bool to render a "skipped_install" UI status. Copy reuses the existing SKIPPED_INSTALL_DETAILS string so the tooltip matches the policy status page's Details column.
• UX: "Patch skipped" uses the same grey error-outline glyph as the policy status page (deferred, not a failure). The status is intentionally not clickable — the install was skipped, so there is no run to open a details modal for.
• UX (tooltip position): wrapped the InstallStatusCell tooltip with fixedPositionStrategy so it no longer renders off to the left when the table has a single row.
• Docs: documented skipped_install on both the admin (/hosts/:id/software) and Fleet Desktop (/device/:token/software) endpoints; they share the response struct.
• The getUiStatus skip branch runs before the failed-install → failed_install_installed / failed_install_update_available downgrades, so a skip on a title with a newer installer version still surfaces as skipped rather than "Update available".

Screenrecording

• Host details > Software > Library, single-row filtered view: skipped install shows "Patch skipped" with the grey ! icon; tooltip centers above the cell.

Testing

• Added/updated automated tests
• QA'd all new/changed functionality manually

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.81%. Comparing base (23f3c5c) to head (6ece184).
⚠️ Report is 47 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #52567      +/-   ##
==========================================
+ Coverage   75.78%   75.81%   +0.03%     
==========================================
  Files        4090     4095       +5     
  Lines      247277   247386     +109     
  Branches    14255    14299      +44     
==========================================
+ Hits       187389   187558     +169     
+ Misses      59711    59650      -61     
- Partials      177      178       +1     

Flag	Coverage Δ
frontend	67.86% <100.00%> (+0.24%)	⬆️

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