RFR: 8349475: Test tools/javac/api/TestJavacTaskWithWarning.java writes files in src dir [v3]

[Joe Darcy]

> Correct generating files into the work directory, not the directory of test sources.

Joe Darcy has updated the pull request incrementally with one additional commit since the last revision:

  Correct implementation of review feedback.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/23527/files
  - new: https://git.openjdk.org/jdk/pull/23527/files/9f26b21d..c8bf9891

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=23527&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=23527&range=01-02

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/23527.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23527/head:pull/23527

PR: https://git.openjdk.org/jdk/pull/23527