Separate out test related go.mod files #1861

Job	Run time
build-container	4m 34s
e2e (capx-feature-test) / e2e-test	2m 20s
e2e (clusterclass) / e2e-test	2m 6s
e2e (scaling) / e2e-test	2m 12s
e2e (clusterctl-upgrade) / e2e-test	2m 11s
	13m 23s

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