RFR: 8348212: Need to add warn() step to JavacTaskImpl after JDK-8344148 [v2]

[Archie Cobbs]

On Fri, 24 Jan 2025 16:56:36 GMT, Maurizio Cimadamore <mcimadamore at openjdk.org> wrote:

> probably just add...

Agreed, that's simpler. At first when writing this test I thought I was going to utilize more stuff from the superclass (`TestJavacTask`) but in the end didn't need it.

Cleaned up in a9b5f2d63cd.

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PR Review Comment: https://git.openjdk.org/jdk/pull/23223#discussion_r1929012938