RFR: 8371503: RETAIN_IMAGE_AFTER_TEST do not work for some tests [v3]

[SendaoYan]

> Hi all,
> 
> The DockerTestUtils.RETAIN_IMAGE_AFTER_TEST variable which read the property from "jdk.test.docker.retain.image" do not work for some of the docker tests, such as jdk/internal/platform/docker/TestDockerCpuMetrics.java, only works for some of the docker tests, such as jdk/internal/platform/docker/TestPidsLimit.java.
> 
> This PR read the DockerTestUtils.RETAIN_IMAGE_AFTER_TEST inside function removeDockerImage instead of before all the fucntion removeDockerImage. This will make all the docker tests receive the property jdk.test.docker.retain.image.
> 
> Change has been verified locally on linux-x64 by run the all touched tests.

SendaoYan has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:

 - Merge branch 'openjdk:master' into jbs8371503
 - Remove extra ident
 - 8371503: RETAIN_IMAGE_AFTER_TEST do not work for some tests

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/28208/files
  - new: https://git.openjdk.org/jdk/pull/28208/files/5e39c8f3..0bfbe8ae

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=28208&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=28208&range=01-02

  Stats: 301873 lines in 2852 files changed: 201864 ins; 58740 del; 41269 mod
  Patch: https://git.openjdk.org/jdk/pull/28208.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28208/head:pull/28208

PR: https://git.openjdk.org/jdk/pull/28208