RFR: 8360571: Description of launchers is lost in two phase packaging [v2]

[Alexey Semenyuk]

> Store launcher descriptions in `.jpackage.xml` file so that they don't get lost in two-step packaging

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

  AppImageFile: fix exception message

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Changes:
  - all: https://git.openjdk.org/jdk/pull/28436/files
  - new: https://git.openjdk.org/jdk/pull/28436/files/8d7c0b7c..183f88f7

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=28436&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=28436&range=00-01

  Stats: 4 lines in 1 file changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/28436.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28436/head:pull/28436

PR: https://git.openjdk.org/jdk/pull/28436