Reference Issues/PRs

• [ENH] Rework of base series annotator API #6265
• [ENH] detection module suite tests coverage extension for methods #6958

What does this implement/fix? Explain your changes.

• Removes unused references to the deprecated _fmt attribute within child detectors, specifically in the CLASP and pyOD implementations.
• Following discussion confirming that _fmt distinctions for sparse vs. dense outputs are no longer applicable, this update ensures these distinctions are handled through standardized predict and transform methods rather than internal _fmt cases.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.