Removing applyConversion in VectorField API #1640

Job	Run time
cache-pixi-lock / Generate output	12s
Unit tests: ubuntu \| pixi run -e test-latest tests	2m 11s
Unit tests: ubuntu \| pixi run -e test-py311 tests	2m 20s
Unit tests: ubuntu \| pixi run -e test-minimum tests	2m 9s
TypeChecking: pixi run typing	0s
Integration: ${{ matrix.os }} \| pixi run -e ${{ matrix.pixi-environment }} tests-notebooks	0s
merge-test-artifacts	0s
	6m 52s

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