[java] DriverFinderTest property fixture doesn't clear/restore selenium.webdriver.verbose

### Motivation

Follow-up to #17832/#17833. That PR's round-2 review pass fixed the identical fixture-hygiene gap (test setup only saving/clearing `selenium.debug`, not its legacy alias `selenium.webdriver.verbose`) in `LoggingOptionsTest.java`, `RemoteWebDriverInitializationTest.java`, and `RetryRequestTest.java`.

`java/test/org/openqa/selenium/remote/service/DriverFinderTest.java:81-100` has the same gap: its property save/restore only handles `selenium.debug`, so a JVM with `selenium.webdriver.verbose` set externally could leak state across tests in this file. It was out of scope for the round-2 coder (not in the original findings list) so it's tracked here rather than fixed silently.

### Suggested fix

Mirror the fixture pattern already applied to the three files above: save both properties before the test, clear both, restore both after.

### Context
Umbrella tracker: #17833

Open java/test/org/openqa/selenium/remote/service/DriverFinderTest.java:81-100 and compare its fixture with the corresponding setup in LoggingOptionsTest.java, RemoteWebDriverInitializationTest.java, and RetryRequestTest.java. Run DriverFinderTest after updating the fixture; done means both selenium.debug and selenium.webdriver.verbose are saved, cleared before the test, and restored afterward.

Written by the indexing model from the issue text.