[Experimental]Use Roborazzi outputDir extension

[takahirom]

---

name: Pull request
about: Create a pull request
label: 'triage me'

Thank you for opening a Pull Request!
Before submitting your PR, there are a few things you can do to make sure it goes smoothly:

• Make sure to open a GitHub issue as a bug/feature request before writing your code! That way
  we can discuss the change, evaluate designs, and agree on the general idea
• Ensure the tests and linter
  pass (./gradlew --init-script gradle/init.gradle.kts spotlessApply to automatically apply
  formatting)
• Appropriate docs were updated (if necessary)

Is this your first Pull Request?

• Run ./tools/setup.sh
• Import the code formatting style as explained in the setup script.

Fixes #<issue_number_goes_here> 🦕

[lihenggui]

Thanks for your contribution!