RFR: 8350601: Miscellaneous updates to jpackage test lib

[Alexey Semenyuk]

On Mon, 24 Feb 2025 19:18:27 GMT, Alexey Semenyuk <asemenyuk at openjdk.org> wrote:

> - Unify TKit.createTempDirectory() and TKit.createTempFile() functions. Remove `throws IOexception` from their signatures. Add relevant tests.
>  - JPackageCommand.java: remove try/catch(IOexception) around `TKit.createTempDirectory()` call.
>  - AppImagePackageTest.java: replace `TKit.createTempDirectory(null)` with `TKit.createTempDirectory("appimage")` to fix NPE.
>  - Make `TKit.assertDirectoryExists(Path, Optional<Boolean>)` private. This is internal and shouldn't be exposed.
>  - add `TKit.assertEquals(boolean, boolean)` and `TKit.assertNotEquals(boolean, boolean)` with tests.
>  - AdditionalLauncher.java: remove redundant code duplicating functionality of `TKit.createTempFile()` (should have been cleaned long ago).
>  - JPackageCommand.java: add a check for the main jar in the app image if the main jar was specified. Missing part of [JDK-8325089](https://bugs.openjdk.org/browse/JDK-8325089).

@sashamatveev PTAL

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PR Comment: https://git.openjdk.org/jdk/pull/23754#issuecomment-2679446041