RFR: 8354327: Rewrite runtime/LoadClass/LoadClassNegative.java

[Anton Artemov]

Rewrote the test  runtime/LoadClass/LoadClassNegative so that it creates a dummy jar file on the fly and then removes it. Previously existing dummy.jar removed.

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Commit messages:
 - 8354327: Addressed reviewer's comments
 - 8354327: Rewrite runtime/LoadClass/LoadClassNegative.java

Changes: https://git.openjdk.org/jdk/pull/24688/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24688&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8354327
  Stats: 11 lines in 2 files changed: 8 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/24688.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24688/head:pull/24688

PR: https://git.openjdk.org/jdk/pull/24688