RFR: 8293453: tools/jpackage/share/AddLShortcutTest.java "Failed: Check the number of mismatched pixels [1024] of [1024] is < [0.100000] threshold"

[Alexey Semenyuk]

- throw an exception if icon swap fails with the corresponding l10n message;
- add retries to the jpackage test routine that extracts an icon from a launcher

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Commit messages:
 - 8293453: tools/jpackage/share/AddLShortcutTest.java "Failed: Check the number of mismatched pixels [1024] of [1024] is < [0.100000] threshold"

Changes: https://git.openjdk.org/jdk/pull/11521/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11521&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8293453
  Stats: 45 lines in 6 files changed: 34 ins; 2 del; 9 mod
  Patch: https://git.openjdk.org/jdk/pull/11521.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11521/head:pull/11521

PR: https://git.openjdk.org/jdk/pull/11521