#2039: Added workaround for app icon in MacOS Dock

[oanding-blrng]

This PR fixes: #2039

Implemented changes:

• Added method in App.java to set icon in taskbar/dock in macOS with workaround and condition to only call new method, if we are on a macOS system

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Testing instructions

Please add conscise, understandable instructions on how a reviewer can test/verify the functionality of your contribution here:

1. Start the ide gui with AppLauncher
2. The icon defined under gui/src/main/resources/com/devonfw/ide/gui/assets/devonfw.png will be used as the icon in the taskbar/dock

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Checklist for this PR

Make sure everything is checked before merging this PR. For further info please also see
our DoD.

• When running mvn clean test locally all tests pass and build is successful
• PR title is of the form #«issue-id»: «brief summary» (e.g. #921: fixed setup.bat). If no issue ID exists, title only.
• PR top-level comment summarizes what has been done and contains link to addressed issue(s)
• PR and issue(s) have suitable labels
• Issue is set to In Progress and assigned to you or there is no issue (might happen for very small PRs)
• You followed all coding conventions
• You have added the issue implemented by your PR in CHANGELOG.adoc unless issue is labeled
  with internal
• You have formulated clear instructions on how to test your contribution under "Testing instructions"

[coveralls]

Coverage Report for CI Build 29334321101

Warning

No base build found for commit a88c41e on main.
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If a base build is processing, this comment will update automatically when it completes.

Coverage: 72.181%

Details

• Patch coverage: No coverable lines changed in this PR.

Uncovered Changes

No uncovered changes found.

Coverage Regressions

Requires a base build to compare against. How to fix this →

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Coverage Stats

Relevant Lines:	16744
Covered Lines:	12590
Line Coverage:	75.19%
Relevant Branches:	7466
Covered Branches:	4885
Branch Coverage:	65.43%
Branches in Coverage %:	Yes
Coverage Strength:	3.18 hits per line

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💛 - Coveralls

[oanding-blrng]

As of time of writing two tests regarding the localization are failing:

[ERROR] Tests run: 15, Failures: 2, Errors: 0, Skipped: 0, Time elapsed: 0.224 s <<< FAILURE! -- in com.devonfw.ide.gui.nls.NlsServiceTest
[ERROR] com.devonfw.ide.gui.nls.NlsServiceTest.testLanguageDisplayShowsLocaleName -- Time elapsed: 0.018 s <<< FAILURE!
org.opentest4j.AssertionFailedError:

expected: "English (en)"
 but was: "Deutsch (de)"
        at com.devonfw.ide.gui.nls.NlsServiceTest.testLanguageDisplayShowsLocaleName(NlsServiceTest.java:113)
        at java.base/java.lang.reflect.Method.invoke(Method.java:565)
        at java.base/java.util.ArrayList.forEach(ArrayList.java:1604)
        at java.base/java.util.ArrayList.forEach(ArrayList.java:1604)

[ERROR] com.devonfw.ide.gui.nls.NlsServiceTest.testGetInstanceWithLocale -- Time elapsed: 0.007 s <<< FAILURE!
org.opentest4j.AssertionFailedError:

expected: "English (en)"
 but was: "Deutsch (de)"
        at com.devonfw.ide.gui.nls.NlsServiceTest.testGetInstanceWithLocale(NlsServiceTest.java:66)
        at java.base/java.lang.reflect.Method.invoke(Method.java:565)
        at java.base/java.util.ArrayList.forEach(ArrayList.java:1604)
        at java.base/java.util.ArrayList.forEach(ArrayList.java:1604)

All other tests are running successfully.