Remove Pax CDI support

[jbonofre]

Summary

• Remove all Pax CDI references: version property, Maven dependencies, feature repository entries, and override configurations
• Delete PaxCdiFeaturesTest integration test class and CDI user guide documentation
• Clean up LICENSE files, provisioning docs, and feature repo-refresh test that referenced pax-cdi

Pax CDI is no longer maintained and is incompatible with Pax Web 11.x (requires Pax Web < 9.0).

Test plan

• Verify the build compiles successfully without pax-cdi dependencies
• Run integration tests to ensure no remaining references cause failures
• Confirm feature:repo-list no longer includes pax-cdi repository

[github-actions]

Test Results

237 files   - 1  237 suites   - 1   23m 58s ⏱️ +26s
924 tests  - 6  875 ✅  - 3  49 💤  - 3  0 ❌ ±0 
928 runs   - 6  879 ✅  - 3  49 💤  - 3  0 ❌ ±0 

Results for commit 7b70db0. ± Comparison against base commit ef6e2da.

This pull request removes 6 tests.

org.apache.karaf.itests.features.PaxCdiFeaturesTest ‑ installPaxCdiFeature
org.apache.karaf.itests.features.PaxCdiFeaturesTest ‑ installPaxCdiOpenwebbeansFeature
org.apache.karaf.itests.features.PaxCdiFeaturesTest ‑ installPaxCdiWebFeature
org.apache.karaf.itests.features.PaxCdiFeaturesTest ‑ installPaxCdiWebOpenwebbeansFeature
org.apache.karaf.itests.features.PaxCdiFeaturesTest ‑ installPaxCdiWebWeldFeature
org.apache.karaf.itests.features.PaxCdiFeaturesTest ‑ installPaxCdiWeldFeature