RFR: 8358729: jdk/internal/loader/URLClassPath/ClassnameCharTest.java depends on Applet

[Justin Lu]

Please review this PR which finishes Applet removal for the test: jdk/internal/loader/URLClassPath/ClassnameCharTest.java.

`testclasses.jar` is updated such that the two classes no longer extend Applet.


$ javap fo\ o.class 
public class fo o {
}
$ javap æ$'\302\211'$'\302\213'å$'\302\206'$'\302\214'.class 
public class 手册 {
}


The bug description of [JDK-8358729](https://bugs.openjdk.org/browse/JDK-8358729) contains the original `javap` output for those classes.

Additionally, the security APIs that were marked for removal are also removed from this test as well.

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Commit messages:
 - init

Changes: https://git.openjdk.org/jdk/pull/25703/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25703&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8358729
  Stats: 35 lines in 2 files changed: 0 ins; 25 del; 10 mod
  Patch: https://git.openjdk.org/jdk/pull/25703.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25703/head:pull/25703

PR: https://git.openjdk.org/jdk/pull/25703