RFR: 8355328: Improve negative tests coverage for jpackage signing [v2]

[Alexey Semenyuk]

> Add tests covering `error.explicit-sign-no-cert` error ID to ErrorTest.
> 
> If signing identity validation fails, jpackage outputs three messages constructed from the following string IDs: `error.cert.not.found`, `error.explicit-sign-no-cert`, and `error.explicit-sign-no-cert.advice`.
> 
> `TKit.TextStreamVerifier.andThen()` method doesn't work correctly when combining more than two instances of `TKit.TextStreamVerifier` class. To address this bug and analyze jpackage's output for three expected strings when a non-existent signing identity is specified, the `TKit.TextStreamVerifier.andThen()` method was replaced with the `TKit.TextStreamVerifier.Group` class. Changes in other tests are a result of this change.

Alexey Semenyuk has updated the pull request incrementally with one additional commit since the last revision:

  Fix whitespace

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Changes:
  - all: https://git.openjdk.org/jdk/pull/24786/files
  - new: https://git.openjdk.org/jdk/pull/24786/files/a57b5d8a..8d3d9b5f

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=24786&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=24786&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/24786.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24786/head:pull/24786

PR: https://git.openjdk.org/jdk/pull/24786