Fix missing `ComponentBatchCow` export in public lib #15558

Job	Run time
paths-filter	7s
Checks / Check if running codegen would produce any changes	1m 19s
Checks / Rerun lints	42s
Checks / Lint markdown	25s
Checks / Spell Check	6s
Checks / Misc formatting	20s
Checks / markdown-paths-filter	5s
Checks / Check links	0s
Python Checks	0s
C++ tests	0s
Deploy Landing Preview	0s
Rust Checks / Rust lints (fmt, check, clippy, tests, doc)	37s
Minimum CLI Build / Set Config (linux-x64)	2s
Rust Checks / Test on ${{ matrix.name }}	0s
Build rerun_js / Build rerun_js	32s
Build web viewer / Build web viewer	28s
Minimum CLI Build / Build rerun-cli (ubuntu-latest-16-cores)	1m 9s
Upload Web	0s
Minimum Wheel Build	0s
Minimum Wheel Test	0s
	5m 52s

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