RFR: 8333130: MakeJAR2.sh uses hard-coded JDK version

[Jaikiran Pai]

Can I please get a review of this test-only change which addresses https://bugs.openjdk.org/browse/JDK-8333130?

There are a couple of tests `NativeMethodPrefixApp` and `RetransformApp` under `test/jdk/java/lang/instrument/` which launch  the app/test with a `-javaagent:<jar>` pointing to a test specific jar. The test, launched with that `javaagent`, then verifies the test specific details.

In their current form, in order to construct the agent `.jar` and make it available to the jtreg test that's launched, they `@run` a  jtreg `shell` test. This `shell` test uses the `MakeJAR2.sh` script to generate the jar file. The contents of the script is relatively straightforward - it compiles (using `javac`) some boot classpath classes, some agent specific classes and then generates a jar file with the agent classes and a `MANIFEST.MF` which points to the boot classpath classes along with test specific manifest attributes. In a recent PR the `MakeJAR2.sh` script was updated to pass `--enable-preview --release 23` since one of the existing agent class was updated to use the ClassFile API PreviewFeature (https://github.com/openjdk/jdk/pull/13009).

This generated agent jar then is passed as `-javaagent:` to the subsequent `@run main` test which does the actual testing.

So essentially the `shell` test which uses the `MakeJAR2.sh` is merely there to create a jar file that's needed by the actual test. Within the JDK we have several tests which compile other classes and generate jar files using in-process test libraries and the `java.util.spi.ToolProvider` implementations. These 2 tests too can be updated to use a similar technique, to completely get rid of the `MakeJAR2.sh`. Removing the `MakeJAR2.sh` will simplify the ability to pass around value for `--release` when using `--enable-preview`.

The commit in this PR updates these 2 tests to use `@run driver` which then compiles relevant classes (maintaining the semantics of `MakeJAR2.sh`) and generates the agent jar file and then finally launching the test process. As part of the update, I did not retain the `@author` tag from the 2 test definitions, since it's my understanding that we no longer use those. I will add them back if we should retain them.

The tests continue to pass locally with this change. I've also triggered tier testing in our CI for this change.

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Commit messages:
 - 8333130: MakeJAR2.sh uses hard-coded JDK version

Changes: https://git.openjdk.org/jdk/pull/19495/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19495&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8333130
  Stats: 409 lines in 5 files changed: 265 ins; 131 del; 13 mod
  Patch: https://git.openjdk.org/jdk/pull/19495.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19495/head:pull/19495

PR: https://git.openjdk.org/jdk/pull/19495