RFR: 8367157: Remove jrunscript tool

[Jaikiran Pai]

Can I please get a review of this change which removes the `jrunscript` tool? This addresses https://bugs.openjdk.org/browse/JDK-8367157.

`jrunscript` is an experimental and unsupported tool which was deprecated for removal in Java 24. The commits in this PR remove the tool, its man pages and any references to it in the tests.

tier1 through tier8 have been run with this change in the CI and no related failures have been found. I'll file a CSR for this change and also add a release note.

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Commit messages:
 - remove tests for jrunscript
 - remove jrunscript implementation
 - remove references from tests
 - remove man page for jrunscript

Changes: https://git.openjdk.org/jdk/pull/27163/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27163&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8367157
  Stats: 2364 lines in 24 files changed: 0 ins; 2360 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/27163.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27163/head:pull/27163

PR: https://git.openjdk.org/jdk/pull/27163