[codex] Remove Effect filter instance ID shortcut

[Dragoy]

Summary

Remove the high-level Effect::filter_instance_id() convenience wrapper from after-effects/src/pf/effect.rs.

The lower-level pf::suites::Utility::filter_instance_id() API remains available for callers that intentionally acquire and handle the Premiere utility suite. This avoids presenting the filter instance ID path as a generally available Effect method, since the underlying PF_UtilitySuite can be unavailable in some AE selectors/hosts and return MissingSuite.

Validation

• cargo test -p after-effects

[virtualritz]

Thanks for the cleanup pass. Declining this one: the change removes a working, gracefully-failing convenience method (Effect::filter_instance_id, which already returns Err(MissingSuite) when the utility suite is unavailable), but the stated rationale -- that PF_UtilitySuite can be unavailable -- applies equally to the ~30 sibling utility wrappers generated in the same block (clip_name, clip_duration, media_timecode, etc.) that are left in place. Singling out one method makes the Effect API arbitrarily inconsistent and is a breaking public-API removal with no offsetting benefit. If we want a real API-safety cleanup here, it should be a deliberate, consistent pass over the whole wrapper block rather than a single-method trim. Closing.