RFR: 8367910: Reduce warnings about unsupported classes in AOT cache creation

[Ioi Lam]

Currently AOT cache creation may print lots of warning (depending on the actions performed by the application's training run). Most of these warnings are harmless and are caused by JVM limitations; there's nothing that the user can do about them:


[1.096s][warning][aot] Skipping jdk/internal/event/Event: JFR event class
[1.096s][warning][aot] Skipping jdk/jfr/Event: JFR event class
[1.099s][warning][aot] Skipping jdk/proxy1/$Proxy14: Unsupported location
[1.100s][warning][aot] Skipping jdk/proxy1/$Proxy12: Unsupported location
[1.100s][warning][aot] Skipping jdk/proxy1/$Proxy11: Unsupported location


This PR moves most of these warnings to the "info" level. The only messages that are still logged in the "warning" levels are:

- class is in an error state
- class failed verification

These could indicate issues with the application so it's good to let the user know.

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Commit messages:
 - 8367910: Reduce warnings about unsupported classes in AOT cache creation

Changes: https://git.openjdk.org/jdk/pull/27480/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27480&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8367910
  Stats: 50 lines in 8 files changed: 18 ins; 5 del; 27 mod
  Patch: https://git.openjdk.org/jdk/pull/27480.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27480/head:pull/27480

PR: https://git.openjdk.org/jdk/pull/27480