RFR: 8371503: RETAIN_IMAGE_AFTER_TEST do not work for some tests [v2]

[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 incrementally with one additional commit since the last revision:

  Remove extra ident

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/28208/files
  - new: https://git.openjdk.org/jdk/pull/28208/files/75356d0e..5e39c8f3

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=28208&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=28208&range=00-01

  Stats: 3 lines in 1 file changed: 0 ins; 0 del; 3 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