chore: tag graalvm test images with infrastructure-public-image- suffix

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 an issue as a bug/issue 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
[ ] Code coverage does not decrease (if any source code was changed)
[ ] Appropriate docs were updated (if necessary)

Fixes # ☕️

If you write sample code, please follow the samples format.

googleapis / java-shared-config