RFR: JDK-8286311: remove boilerplate from use of runTests

[Hannes Wallnöfer]

On Tue, 20 Dec 2022 23:13:25 GMT, Jonathan Gibbons <jjg at openjdk.org> wrote:

> Please review a test-only cleanup for JDK 21.
> 
> There are two mostly-automated (IDE) changes here:
> 
> 1. Remove redundant boiler-plate arguments from calls to `JavadocTester.runTests()`.  The use of a function to derive and provide a method-specific directory because unnecessary with JDK-
> 2. Use `var` for the declaration of the `tester` variable found in the `main` method of most javadoc tests.
> 
> The changes were mostly done with IDEA _Replace in Files..._, with some manual fixup for some outlying cases found while checking the code.

Should the copyright header dates also be updated on all tests, or are these changes to small to require that?

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PR: https://git.openjdk.org/jdk/pull/11746