[jdk25u] RFR: 8372753: jpackage ignores --file-associations option with predefined app image [v2]

[Alexey Semenyuk]

> Fix handling of the `--file-associations` option when bundling from the predefined app image. Add relevant tests.

Alexey Semenyuk has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains one new commit since the last revision:

  Add tests

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Changes:
  - all: https://git.openjdk.org/jdk25u/pull/395/files
  - new: https://git.openjdk.org/jdk25u/pull/395/files/7f31e2fc..29d60963

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk25u&pr=395&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk25u&pr=395&range=00-01

  Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk25u/pull/395.diff
  Fetch: git fetch https://git.openjdk.org/jdk25u.git pull/395/head:pull/395

PR: https://git.openjdk.org/jdk25u/pull/395