CodeRabbit Generated Unit Tests: Add unit tests for PR changes

[coderabbitai]

Unit test generation was requested by @nixonyh.

• Add lazy registration support! #100 (comment)

The following files were modified:

• crates/bevy_motiongfx/src/manager.rs
• crates/motiongfx/src/action.rs
• crates/motiongfx/src/lib.rs
• crates/motiongfx/src/pipeline.rs
• crates/motiongfx/src/pipeline/func_pointers.rs
• crates/motiongfx/src/registry.rs
• crates/motiongfx/src/timeline.rs

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[nixonyh]

Closing this, but this can be a good reference point for adding more tests!