RFR: JDK-8326525: com/sun/tools/attach/BasicTests.java does not verify AgentLoadException case

[Alex Menkov]

The change updates the test to throw an exception if expected AgentLoadException is not thrown

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Commit messages:
 - fix

Changes: https://git.openjdk.org/jdk/pull/17971/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17971&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8326525
  Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/17971.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17971/head:pull/17971

PR: https://git.openjdk.org/jdk/pull/17971