RFR: 8309763: Move tests in test/jdk/sun/misc/URLClassPath directory to test/jdk/jdk/internal/loader

[Jaikiran Pai]

Can I please get a review of this test-only change which moves the tests from under `test/jdk/sun/misc/URLClassPath` to `test/jdk/jdk/internal/loader/URLClassPath`? This addresses https://bugs.openjdk.org/browse/JDK-8309763.

As noted in that issue, in Java 9, the `sun.misc.URLClassPath` was moved to `jdk.internal.loader.URLClassPath`. These are some pre-existing tests which are now being moved to this more relevant location.

I've checked that none of the problem list files have this `sun/misc/URLClassPath` directory problem listed. Additionally, I have verified that `sun/misc/URLClassPath` and `jdk/internal/loader` both belong to the same test group (`jdk_lang` which belongs to `tier1`) and as such this refactoring won't impact the test grouping.

tier1 testing with this change has passed.

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Commit messages:
 - 8309763: Move tests in test/jdk/sun/misc/URLClassPath directory to test/jdk/jdk/internal/loader

Changes: https://git.openjdk.org/jdk/pull/14415/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14415&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8309763
  Stats: 0 lines in 5 files changed: 0 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/14415.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14415/head:pull/14415

PR: https://git.openjdk.org/jdk/pull/14415