[jdk21u-dev] RFR: 8374555: No need for visible input warning in s.s.u.Password when not reading from System.in

[Goetz Lindenmaier]

I backport this for parity with 21.0.11-oracle.

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Commit messages:
 - Backport fbc59ac0a1248066e9fbcfde3bd6a8eb4d60992c

Changes: https://git.openjdk.org/jdk21u-dev/pull/2626/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2626&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8374555
  Stats: 80 lines in 2 files changed: 78 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2626.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2626/head:pull/2626

PR: https://git.openjdk.org/jdk21u-dev/pull/2626