Removing applyConversion in VectorField API #1641

Job	Run time
cache-pixi-lock / Generate output	12s
TypeChecking: pixi run typing	0s
Integration: ${{ matrix.os }} \| pixi run -e ${{ matrix.pixi-environment }} tests-notebooks	0s
Unit tests: ubuntu \| pixi run -e test-latest tests	2m 26s
Unit tests: ubuntu \| pixi run -e test-minimum tests	2m 24s
Unit tests: ubuntu \| pixi run -e test-py311 tests	2m 11s
merge-test-artifacts	0s
	7m 13s

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