refactor(mockwebserver): DefaultMockServerTest uses Vert.x to perform verifications

[manusa]

Description

Part of #5632

Updates DefaultMockServerTest to use Vert.x instead of OkHttp to perform the verifications.

This will allow to completely remove OkHttp in a future refactor of the mockwebserver module (#5613). Having the tests in Vert.x will allow us to ensure that the functionality still works without modifying the tests.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• Feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change
• Chore (non-breaking change which doesn't affect codebase;
  test, version modification, documentation, etc.)

Checklist

• Code contributed by me aligns with current project license: Apache 2.0
• I Added CHANGELOG entry regarding this change
• I have implemented unit tests to cover my changes
• I have added/updated the javadocs and other documentation accordingly
• No new bugs, code smells, etc. in SonarCloud report
• I tested my code in Kubernetes
• I tested my code in OpenShift

[sonarqubecloud]

Quality Gate passed

Kudos, no new issues were introduced!

0 New issues
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud