[Fix][Zeta] Use dynamic port allocation for HTTP in RestApiHttpsForTruststoreTest and update Prometheus image

[dybyte]

Purpose of this pull request

Fix intermittent unit-test CI failures in RestApiHttpsForTruststoreTest caused by HTTP port conflicts by dynamically allocating the HTTP port (excluding the fixed HTTP port).

See BaseServletTest.java
for reference.

2025-08-28T13:14:39.2712140Z [ERROR] Failures:
2025-08-28T13:14:39.2713120Z [ERROR] RestApiHttpsForTruststoreTest.testRestApiHttp:92 Expected java.net.ConnectException to be thrown, but nothing was thrown.

Does this PR introduce any user-facing change?

No

How was this patch tested?

The change is covered by existing tests.

Check list

• If any new Jar binary package adding in your PR, please add License Notice according
  New License Guide
• If necessary, please update the documentation to describe the new feature. https://github.com/apache/seatunnel/tree/dev/docs
• If you are contributing the connector code, please check that the following files are updated:
  1. Update plugin-mapping.properties and add new connector information in it
  2. Update the pom file of seatunnel-dist
  3. Add ci label in label-scope-conf
  4. Add e2e testcase in seatunnel-e2e
  5. Update connector plugin_config

[Hisoka-X]

Thanks @dybyte

[corgy-w]

Thanks @dybyte please retry ci

[dybyte]

@Hisoka-X @corgy-w
I found another error in CI test

2025-08-29T02:59:06.9008164Z [ERROR] Errors: 
2025-08-29T02:59:06.9009150Z [ERROR]   PrometheusIT » Completion org.testcontainers.containers.ContainerLaunchExcepti...

It seems like we may need to change the Docker image from bitnami/prometheus:2.53.0 to bitnamilegacy/prometheus:2.53.0. Bitnami patched their Prometheus image after August 28, so the original image no longer work. What do you think?
More details

[Hisoka-X]

change the Docker image from bitnami/prometheus:2.53.0 to bitnamilegacy/prometheus:2.53.0

LGTM.

[dybyte]

All CI checks have passed.