RFR: 8370976: Review the behavioral changes of core reflection descriptor parsing migration

[Chen Liang]

There were a few other holes in the recent migration of BytecodeDescriptor, most notably:

1. BytecodeDescriptor is missing checks for `.`, `[` characters, leading, trailing, consecutive `/`, or empty name.
2. EnclosingMethod is only validated by hotspot to carry either field or method type. We still need to check for field types

I have written up the behavioral changes in the CSR. In addition, I have added a few more tests to ensure the failure case behaviors of the migrated use sites.

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Commit messages:
 - Desc parse migration problems

Changes: https://git.openjdk.org/jdk/pull/28079/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28079&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8370976
  Stats: 152 lines in 7 files changed: 115 ins; 15 del; 22 mod
  Patch: https://git.openjdk.org/jdk/pull/28079.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28079/head:pull/28079

PR: https://git.openjdk.org/jdk/pull/28079