feat: add polling refresh to ReviewQueue and OpsOverview

[rrbanda]

Summary

• ReviewQueue now polls every 30 seconds for fresh agent data, so new review submissions appear without manual refresh
• OpsOverview queue count badge also refreshes every 30 seconds
• Previously both components fetched data once on mount and went stale until the admin navigated away and back
• The backend audit event for draft→review transitions is already emitted (added in earlier PRs)

Part of Epic #3208. Final PR in the Bulletproof Agent Lifecycle series.

Test plan

• Open ReviewQueue → submit an agent for review from another tab → verify it appears within 30s
• Open OpsOverview → submit an agent → verify the queue count updates within 30s
• Verify no excessive API calls (only every 30s)
• Verify cleanup on unmount (no interval leaks)

[rhdh-gh-app]

Missing Changesets

The following package(s) are changed by this PR but do not have a changeset:

• @red-hat-developer-hub/backstage-plugin-augment

See CONTRIBUTING.md for more information about how to add changesets.

Changed Packages

Package Name	Package Path	Changeset Bump	Current Version
@red-hat-developer-hub/backstage-plugin-augment	workspaces/augment/plugins/augment	none	v0.1.0

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

❌ Patch coverage is 0% with 17 lines in your changes missing coverage. Please review.
✅ Project coverage is 53.41%. Comparing base (7d93262) to head (42a3fd5).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3221      +/-   ##
==========================================
- Coverage   53.41%   53.41%   -0.01%     
==========================================
  Files        2373     2373              
  Lines       84895    84901       +6     
  Branches    23568    23568              
==========================================
  Hits        45349    45349              
- Misses      39200    39206       +6     
  Partials      346      346              

Flag	Coverage Δ		*Carryforward flag
adoption-insights	83.58% <ø> (ø)		Carriedforward from 7d93262
ai-integrations	70.03% <ø> (ø)		Carriedforward from 7d93262
app-defaults	69.60% <ø> (ø)		Carriedforward from 7d93262
augment	46.67% <0.00%> (-0.01%)	⬇️
bulk-import	72.86% <ø> (ø)		Carriedforward from 7d93262
cost-management	16.49% <ø> (ø)		Carriedforward from 7d93262
dcm	32.85% <ø> (ø)		Carriedforward from 7d93262
extensions	61.79% <ø> (ø)		Carriedforward from 7d93262
global-floating-action-button	74.30% <ø> (ø)		Carriedforward from 7d93262
global-header	61.68% <ø> (ø)		Carriedforward from 7d93262
homepage	50.92% <ø> (ø)		Carriedforward from 7d93262
konflux	91.01% <ø> (ø)		Carriedforward from 7d93262
lightspeed	68.33% <ø> (ø)		Carriedforward from 7d93262
mcp-integrations	81.59% <ø> (ø)		Carriedforward from 7d93262
orchestrator	36.36% <ø> (ø)		Carriedforward from 7d93262
quickstart	62.88% <ø> (ø)		Carriedforward from 7d93262
sandbox	79.49% <ø> (ø)		Carriedforward from 7d93262
scorecard	83.84% <ø> (ø)		Carriedforward from 7d93262
theme	64.54% <ø> (ø)		Carriedforward from 7d93262
translations	8.49% <ø> (ø)		Carriedforward from 7d93262
x2a	78.59% <ø> (ø)		Carriedforward from 7d93262

*This pull request uses carry forward flags. Click here to find out more.

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[rrbanda]

Closing: superseded by Phase 3 (#3224) which consolidates admin dashboard polling with loading flash prevention.