RFR: 8376751: add preview project anchors to main-line ProblemList files

[Daniel D. Daugherty]

A trivial fix to add preview project anchors to main-line ProblemList files.

Also backports changes from the Valhalla repo to make/RunTests.gmk
to support ProblemList-coh.txt files. This PR also includes the new
ProblemList-coh.txt file, but it contains no entries (yet). Since this is
NOT a complete backport of the changes for:

- [JDK-8375337](https://bugs.openjdk.org/browse/JDK-8375337) [lworld] ProblemList misc svc tests that fail due to JDK-8375332

I'm not handling it as a backport issue.

I've also added missing Copyright headers to some files.

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Commit messages:
 - Merge branch 'master' into JDK-8376751
 - 8376751: add preview project anchors to main-line ProblemList files

Changes: https://git.openjdk.org/jdk/pull/29509/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=29509&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8376751
  Stats: 402 lines in 26 files changed: 380 ins; 2 del; 20 mod
  Patch: https://git.openjdk.org/jdk/pull/29509.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29509/head:pull/29509

PR: https://git.openjdk.org/jdk/pull/29509