Do not add final to a try-with-resources resource

[sullis]

LombokValToFinalVar rewrote val to final var unconditionally. Resources declared in a try-with-resources statement are already implicitly final, so the added final modifier is redundant there.

This checks whether the variable declaration's parent is a J.Try.Resource and, if so, emits plain var instead of final var.

// before
try (val writer = new StringWriter()) {
    writer.append(aaa);
}

// after
try (var writer = new StringWriter()) {
    writer.append(aaa);
}

Adds a test covering the try-with-resources case.

🤖 Generated with Claude Code

[sullis]

Ready for review @greg-at-moderne

[sullis]

CI build is green.

[greg-at-moderne]

Another great contribution. Thank you!