fix(e2e): stub pingIdentity and email config for plugin-sanity

[nickboldt]

Summary

• Add dummy catalog.providers.pingIdentityOrg and notifications.processors.email stubs to app-config.plugin-sanity.yaml so cluster-free plugin-sanity can boot when the catalog index enables those modules.
• Matches existing harness pattern (.invalid hosts / dummy credentials); email uses debug-only stream transport.

Test plan

• plugin-sanity job reaches readiness 200 (no timeout on config.webServer)
• Backend no longer logs missing apiPath / email.sender startup errors
• Scheduled E2E Cluster-free on main recovers after merge

Generated-by: cursor

Ref: https://redhat.atlassian.net/browse/RHIDP-13884

[nickboldt]

this PR seeks to fix a known test failure that prevented me from merging #5226 (comment) until I was able to determine the test was NOT blocking my change.

[github-actions]

The container image build workflow finished with status: cancelled.

[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

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 59.96%. Comparing base (f959fd9) to head (f0cf5c2).
⚠️ Report is 18 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5242      +/-   ##
==========================================
- Coverage   63.69%   59.96%   -3.74%     
==========================================
  Files         123      111      -12     
  Lines        2424     2198     -226     
  Branches      577      546      -31     
==========================================
- Hits         1544     1318     -226     
  Misses        878      878              
  Partials        2        2              

Flag	Coverage Δ
rhdh	59.96% <ø> (-3.74%)	⬇️

Components	Coverage Δ
Backend plugins	∅ <ø> (∅)
Backend app	66.66% <ø> (ø)
Frontend app	58.89% <ø> (ø)
Plugin utils	∅ <ø> (∅)
Dynamic plugins utils	∅ <ø> (∅)

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[github-actions]

Image was built and published successfully. It is available at:

• quay.io/rhdh-community/rhdh:pr-5242
• quay.io/rhdh-community/rhdh:pr-5242-f0cf5c23

[github-actions]

This PR is stale because it has been open 7 days with no activity. Remove stale label or comment or this will be closed in 21 days.