Renamed java_target to java_version resolved

[abmushfiq]

Renamed java_target to java_version

Resolves #21629

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[abmushfiq]

@ebullient

[ebullient]

Renaming the variable doesn't resolve the outstanding issue and may/will cause issues in templates or other areas that are looking for the (already existing/known) "java_target" attribute (via lookup in a map, or the transformed value...)

Minimally, independent-projects/tools/devtools-common/src/main/java/io/quarkus/devtools/codestarts/quarkus/QuarkusCodestartData.java and independent-projects/tools/devtools-common/src/test/java/io/quarkus/devtools/project/codegen/CreateProjectHelperTest.java also have to be changed.

But the bigger issue remains that renaming the variable / changing the key value does not resolve the issue.

[ebullient]

For comparison / reference, see #22848. The key to resolving the issue was updating the CLI and the Maven Mojo to allow the parameter to be specified. Renaming variables is much less important (and depending on where you are in a release cycle, unnecessarily disruptive).