8228960: [TESTBUG] containers/docker/TestJcmdWithSideCar.java: jcmd reports main class as 'Unknown'

[vieiro]

Backport of JDK-8228960 for parity with 11.0.24-oracle This also paves the way for future container-related tests.

Tested on Fedora 40 with Docker version 27.0.1, build 7fafd33

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Test summary
==============================
   TEST                                              TOTAL  PASS  FAIL ERROR   
   jtreg:test/hotspot/jtreg/containers/docker/TestJcmdWithSideCar.java
                                                         1     1     0     0   
==============================
TEST SUCCESS

Backport is clean but for a single empty newline in test/hotspot/jtreg/ProblemList.txt, that was introduced by JDK-8228904 (see commit e3aa4909 ) which was not backported to 11.

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Progress

• [ ] Change must be properly reviewed (1 review required, with at least 1 Reviewer)
• [x] Change must not contain extraneous whitespace
• [x] Commit message must refer to an issue
• [ ] JDK-8228960 needs maintainer approval

Issue

• JDK-8228960: [TESTBUG] containers/docker/TestJcmdWithSideCar.java: jcmd reports main class as 'Unknown' (Bug - P4)

Reviewing

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