RFR: 8340326: Remove references to Applet in core-libs/security tests [v3]

[Justin Lu]

> Please review this PR which removes usages of Applet within the corelibs tests.
> 
> Most changes are removed comments/updated var names. The JBS issue lists more files than the ones included in this pull request, please see the comment on the JBS issue for the reason why they were not included.

Justin Lu has updated the pull request incrementally with one additional commit since the last revision:

  restore DefaultTimeZoneTest.java as a manual test using PassFailJFrame

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Changes:
  - all: https://git.openjdk.org/jdk/pull/21096/files
  - new: https://git.openjdk.org/jdk/pull/21096/files/cc860712..6b2c060b

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=21096&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=21096&range=01-02

  Stats: 120 lines in 2 files changed: 119 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/21096.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21096/head:pull/21096

PR: https://git.openjdk.org/jdk/pull/21096