fix(catalog): replace phantom yamlMCPArtifact struct with generated o… #7770

Job	Run time
mypy	38s
Check autogenerated code is in sync (3.12, 20)	43s
Catalog E2E	2m 50s
lint	31s
docs-build	44s
E2E Py 3.12 K8s v1.34.3 DB db	12m 33s
E2E Py 3.13 K8s v1.34.3 DB db	12m 9s
E2E Py 3.12 K8s v1.33.7 DB db	12m 12s
E2E Py 3.11 K8s v1.33.7 DB db	12m 1s
E2E Py 3.12 K8s v1.33.7 DB postgres	12m 2s
E2E Py 3.12 K8s v1.34.3 DB postgres	11m 41s
E2E Py 3.14 K8s v1.34.3 DB db	3m 26s
E2E Py 3.10 K8s v1.33.7 DB db	12m 4s
	1h 33m 34s

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