RFR: Merging JShell's file locations mapping into the 'compiler' label, and deleting mapping for 'kulla'.

[Jan Lahoda]

There's a proposal to dissolve the Kulla project (the project that introduced JShell into JDK), and use the `compiler-dev` mailing list instead of `kulla-dev`:
https://mail.openjdk.org/pipermail/kulla-dev/2025-June/005928.html

The idea in this PR is to merge the file mappings used for JShell into the `compiler` label, so that changes touching JShell get the `compiler` label, and the e-mails are sent to `compiler-dev`.

Please let me now if there's something better than can be done, or what more is needed to stop using the `kulla-dev` list.

Thanks!

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Commit messages:
 - Merging JShell's file locations mapping into the 'compiler' label, and deleting mapping for 'kulla'.

Changes: https://git.openjdk.org/skara/pull/1724/files
  Webrev: https://webrevs.openjdk.org/?repo=skara&pr=1724&range=00
  Stats: 14 lines in 1 file changed: 6 ins; 8 del; 0 mod
  Patch: https://git.openjdk.org/skara/pull/1724.diff
  Fetch: git fetch https://git.openjdk.org/skara.git pull/1724/head:pull/1724

PR: https://git.openjdk.org/skara/pull/1724