Inline `BaseVectorImportTask` and remove deprecated `ml_tools.utils` … #1950

Job	Run time
check-code-pylint-and-mypy	3m 58s
check-pre-commit-hooks	27s
mirror-and-integration-test-on-gitlab	1m 13s
test-on-github (3.9)	5m 2s
test-on-github (3.10)	4m 20s
test-on-github (3.11)	4m 0s
test-on-github (3.8, true)	12m 3s
	31m 3s

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