fix: honor JBANG_USE_NATIVE when updating

[arnabnandy7]

Summary

Fixes #2611.

jbang version --update now respects JBANG_USE_NATIVE. When native mode is enabled, JBang downloads and installs the release bundle matching the current operating system and architecture instead of always downloading the generic JAR-based package.

On Windows, an in-use native executable is staged as .exe.new and replaced by the launcher on the next invocation.

The JBANG_USE_NATIVE installation documentation and relevant tests have also been updated.

Validation

• ./gradlew spotlessCheck compileTestJava
• ./gradlew test --tests "dev.jbang.cli.TestApp"
• PowerShell tests in TestScriptNativeDownload

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[quintesse]

Very nice!

I would like to see one change though, Right now it only uses the JBANG_USE_NATIVE environment variable to determine if it should install a native bundle or not.

I would suggest that if you're currently running the native version it should also take that as a sign to install the native bundle. (Who knows, perhaps the user simply ran the native executable manually instead of setting JBANGT_USE_NATIVE)

[arnabnandy7]

@quintesse the requested behavior is now implemented. Native bundle selection will now triggered by either JBANG_USE_NATIVE=true or JavaUtil.inNativeImage().

[quintesse]

LGTM, it works , any improvements can always be done at a later time

[arnabnandy7]

@quintesse fixed merge conflict in one of the file, please re-review