text: Title: Remove dangling usage of _fmt attribute in child detectors
  Body: #### Reference Issues/PRs
  - https://github.com/sktime/sktime/pull/6265
  - https://github.com/sktime/sktime/pull/6958
  
  #### What does this implement/fix? Explain your changes.
  - Removes unused references to the deprecated `_fmt` attribute within child detectors, specifically in the [CLASP](https://github.com/sktime/sktime/blob/main/sktime/annotation/clasp.py#L263-L268) and [pyOD](https://github.com/sktime/sktime/blob/main/sktime/annotation/adapters/_pyod.py#L91-L112) implementations.
  - Following [discussion](https://github.com/sktime/sktime/pull/6958#issuecomment-2467521757) confirming that `_fmt` distinctions for sparse vs. dense outputs are no longer applicable, this update ensures these distinctions are handled through standardized `predict` and `transform` methods rather than internal `_fmt` cases.
  - Deprecation of `_fmt` was originally committed in [#6265](https://github.com/sktime/sktime/pull/6265).
  