ComponentBatch doesn't implement AsComponents anymore

[teh-cmc]

This makes it impossible to pass something implementing ComponentBatch (i.e. some native data that knows how to serialized itself into arrow component data) directly to RecordingStream::log.

This forces the caller to either..:

• explicitly opt into the low-level / component-level APIs via my_data.serialized(), which expose further custom-tagging facilities, or
• use the archetype-level APIs instead, which handle tagging automatically.

Similarly, this removes all the legacy support infrastructure that was needed to carry ComponentBatches all the way to the logger:

• log_component_batches
• AsComponents::as_component_batches
• ComponentBatchCow, ComponentBatchCowWithDescriptor, ...
• etc

I think this is all that's needed in order to..:

• fix Enforce usage of tagged logging APIs: Rust #8757

At the very least, it makes sure that existing code that used to log ComponentBatches directly breaks at compile-time.

[github-actions]

Web viewer built successfully. If applicable, you should also test it:

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Result	Commit	Link	Manifest
✅	81bac95	https://rerun.io/viewer/pr/8820	+nightly +main

^{Note: This comment is updated whenever you push a commit.}

[teh-cmc]

@rerun-bot full-check

[github-actions]

Started a full build: https://github.com/rerun-io/rerun/actions/runs/12992792501

[teh-cmc]

@rerun-bot full-check

[github-actions]

Started a full build: https://github.com/rerun-io/rerun/actions/runs/12994028275

[Wumpf]

Have something very very similar in progress in C++, so looks like we're aligned on how to go about this!