RFR: JDK-8289798: Update to use jtreg 7

[Christian Stein]

On Wed, 6 Jul 2022 08:24:21 GMT, Christian Stein <cstein at openjdk.org> wrote:

> Please review the change to update to using jtreg 7.
> 
> The primary change is to the `jib-profiles.js` file, which specifies the version of jtreg to use, for those systems that rely on this file. In addition, the `requiredVersion` has been updated in the various `TEST.ROOT` files.

No. I'll mark this PR ready for review when all tiers ran successfully.

Besides the usual bug fixes, updates, and minor improvements (see [changes since jtreg 6.2](https://github.com/openjdk/jtreg/compare/jtreg-6.2+1...jtreg-7+1)) the sole major new feature of jtreg 7 is:
- Run tests annotated with `@run junit` via JUnit Platform's Launcher (version `1.8.2`). This enables writing tests using the Jupiter API (version `5.8.2`) in addition to writing and running JUnit 4-based tests.

The change in `junit.java` will be superseded by https://github.com/openjdk/jdk/pull/9944 which deletes that file.

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PR: https://git.openjdk.org/jdk/pull/9393