Remove kbatch, prefect and clearml #2896

Job	Run time
Test Nebari Provider (aws, none)	1m 20s
Test Nebari Provider (aws, github-actions)	1m 4s
Test Nebari Provider (aws, gitlab-ci)	1m 3s
Test Nebari Provider (azure, none)	1m 31s
Test Nebari Provider (azure, github-actions)	1m 53s
Test Nebari Provider (azure, gitlab-ci)	1m 39s
Test Nebari Provider (do, none)	1m 24s
Test Nebari Provider (do, github-actions)	59s
Test Nebari Provider (do, gitlab-ci)	1m 24s
Test Nebari Provider (gcp, none)	1m 44s
Test Nebari Provider (gcp, github-actions)	1m 11s
Test Nebari Provider (gcp, gitlab-ci)	1m 42s
Test Nebari Provider (local, none)	1m 20s
Test Nebari Provider (local, github-actions)	1m 41s
Test Nebari Provider (local, gitlab-ci)	1m 31s
Test Nebari Provider (existing, none)	1m 12s
Test Nebari Provider (existing, github-actions)	1m 30s
Test Nebari Provider (existing, gitlab-ci)	1m 18s
	25m 26s

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