[jdk20] RFR: 8299740: CaptureCallState is missing @Preview annotation

[Maurizio Cimadamore]

This patch adds `@Preview` to the CaptureCallState interface.

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Commit messages:
 - Add @Preview annotation to CaptureCallState

Changes: https://git.openjdk.org/jdk20/pull/86/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk20&pr=86&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8299740
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk20/pull/86.diff
  Fetch: git fetch https://git.openjdk.org/jdk20 pull/86/head:pull/86

PR: https://git.openjdk.org/jdk20/pull/86