RFR: 8309391: Remove non-failing tests from test/jdk/ProblemList-Virtual.txt

[Chris Plummer]

The following two tests no longer seem to be failing with the virtual thread test factory:

com/sun/jdi/RedefineG.java 8285422 generic-all
com/sun/jdi/RedefineTTYLineNumber.java 8285422 generic-all

They can be removed from the problem list. I also updated a couple of entries to refer to existing CRs that give more specific reasons for why the tests are failing.

I tested locally using JTREG_TEST_THREAD_FACTORY=Virtual. I also have a mach5 tier5 job in progress that will do all the virtual thread testing.

I'd like to push this as a trivial change.

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Commit messages:
 - remove some non-failings tests from problem list

Changes: https://git.openjdk.org/jdk/pull/14290/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14290&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8309391
  Stats: 4 lines in 1 file changed: 0 ins; 2 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/14290.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14290/head:pull/14290

PR: https://git.openjdk.org/jdk/pull/14290