RFR: 8318480: UseCounterDecay and CounterDecayMinIntervalLength are unused and should be removed

[Daniel Lundén]

This changeset deprecates the leftover (i.e., no longer used for anything) product compiler flag `UseCounterDecay` (requires CSR) and removes the leftover develop flag `CounterDecayMinIntervalLength`.

Changes:
- Deprecate `UseCounterDecay` in JDK 22, obsolete it in JDK 23, and expire it in JDK 24. The flag is, in fact, already obsolete, so I've also removed it from the source code (except for the definition in `globals.hpp` which must remain until obsoletion).
- Completely remove `CounterDecayMinIntervalLength`.

### Testing
Platforms: windows-x64, linux-x64, linux-aarch64, macosx-x64, macosx-aarch64.
- `tier1`
- HotSpot parts of `tier2` and `tier3`

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Commit messages:
 - Fix issue

Changes: https://git.openjdk.org/jdk/pull/16673/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=16673&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8318480
  Stats: 38 lines in 21 files changed: 1 ins; 16 del; 21 mod
  Patch: https://git.openjdk.org/jdk/pull/16673.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16673/head:pull/16673

PR: https://git.openjdk.org/jdk/pull/16673