RFR: 8313954: Add gc logging to vmTestbase/vm/gc/containers/Combination05

[Stefan Karlsson]

Add GC logging to the tests so that we can get more information about why the test sometimes times out.

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Commit messages:
 - 8313954: Add gc logging to vmTestbase/vm/gc/containers/Combination05

Changes: https://git.openjdk.org/jdk/pull/15190/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15190&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8313954
  Stats: 2 lines in 1 file changed: 1 ins; 1 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/15190.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15190/head:pull/15190

PR: https://git.openjdk.org/jdk/pull/15190