[PDF Ink Signatures] Parameterize PdfInkModule.*Tests

Parameterize PdfInkModule.*Tests so that they run with the text
highlighting feature param enabled and disabled. This ensures that the
existing functionality is preserved while the feature param is disabled,
but also gives test coverage for any new changes introduced in the text
highlighting feature when enabled.

Bug: 342445982
Change-Id: I7efed7518ad2cfc0470e4f8a50259f749f6da1b0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6329760
Commit-Queue: Andy Phan <andyphan@chromium.org>
Reviewed-by: Alan Screen <awscreen@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1430595}