RFR: 8341778: Some javac tests ignore the result of JavacTask::call

[Aleksey Shipilev]

On Wed, 4 Jun 2025 21:02:04 GMT, Vicente Romero <vromero at openjdk.org> wrote:

> Several tests are ignoring the result of invoking com.sun.source.util.JavacTask::call which returns a `Boolean`. This implies that tests could seem to pass when in reality they are silently failing. This PR is fixing this issue by checking, in all applicable cases the result of the invocation.
> 
> TIA

Marked as reviewed by shade (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/25645#pullrequestreview-2900652359