feat(medcat-trainer): Avoid loading meta cat upon model pack upload (… #1030

Job	Run time
test-resource-utils	9s
types-lints-tests-regression (3.13)	21m 7s
types-lints-tests-regression (3.12)	23m 57s
types-lints-tests-regression (3.11)	21m 6s
types-lints-tests-regression (3.10)	21m 27s
base-install-imports	55s
	1h 28m 41s

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