[jdk17u-dev] RFR: 8267163: Rename anonymous loader tests to hidden loader tests

[Goetz Lindenmaier]

I backport this for parity with 17.0.4-oracle.

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Commit messages:
 - Backport 5c21c0044104b52fcaf3f3a830ea6e219d504ada

Changes: https://git.openjdk.java.net/jdk17u-dev/pull/232/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17u-dev&pr=232&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8267163
  Stats: 900 lines in 14 files changed: 900 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk17u-dev/pull/232.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17u-dev pull/232/head:pull/232

PR: https://git.openjdk.java.net/jdk17u-dev/pull/232