RFR: 8344316: Add extra line in security/auth/callback/TextCallbackHandler/Password.java to make clear it is not a JTReg test [v5]

[Mikhail Yankelevich]

> * Add extra line in security/auth/callback/TextCallbackHandler/Password.java to make clear it is not a JTReg test
> * Test will now fail if run with JTReg

Mikhail Yankelevich has updated the pull request incrementally with one additional commit since the last revision:

  reworked the test to be able to run automatically with jtreg

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Changes:
  - all: https://git.openjdk.org/jdk/pull/22951/files
  - new: https://git.openjdk.org/jdk/pull/22951/files/f162cccc..43553d62

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=22951&range=04
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22951&range=03-04

  Stats: 49 lines in 1 file changed: 22 ins; 14 del; 13 mod
  Patch: https://git.openjdk.org/jdk/pull/22951.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22951/head:pull/22951

PR: https://git.openjdk.org/jdk/pull/22951