Fix update-test-outputs script to use test-specific prettier options.

[motlin]

Before this change, checking out the project and running update-test-outputs would make changes to the test outputs.

❯ npm run build && npm run update-test-outputs
❯ git status
HEAD detached at upstream/main
Changes not staged for commit:
  (use "git add <file>..." to update what will be committed)
  (use "git restore <file>..." to discard changes in working directory)
        modified:   packages/prettier-plugin-java/test/unit-test/binary_expressions/operator-position-start/_output.java
        modified:   packages/prettier-plugin-java/test/unit-test/require-pragma/invalid-pragma/_output.java

no changes added to commit (use "git add" and/or "git commit -a")

The change here is to use the test-specific configuration while recording tests. With this change, running npm run update-test-outputs doesn't make any changes to any files.

[jtkiesel]

Thank you for this contribution! It will certainly make testing the printer much easier during development. I added a couple suggestions for minor improvements, let me know what you think.

[motlin]

Thanks for the feedback. I think I addressed your points by renaming the files to .prettierrc.json and by removing the prettierOptions parameter in favor of always loading .prettierrc.json instead.

[jtkiesel]

Thank you for the quick changes and the rebase! It looks great. 👍