[jdk21u-dev] RFR: 8334562: Automate com/sun/security/auth/callback/TextCallbackHandler/Default.java test

[Goetz Lindenmaier]

I backport this for parity with 21.0.6-oracle.

I include follow-up 8335344.

Two clean backports.

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Commit messages:
 - Backport 8335344
 - Backport f4d8c005b35ce34c96027b7f3abb7a307bca3f4c

Changes: https://git.openjdk.org/jdk21u-dev/pull/976/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=976&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8334562
  Stats: 211 lines in 5 files changed: 18 ins; 170 del; 23 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/976.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/976/head:pull/976

PR: https://git.openjdk.org/jdk21u-dev/pull/976