Add support for generating ssl certs via DNS challenge (via Cloudflare) #5276

Job	Run time
Test Nebari Provider (aws, none)	1m 14s
Test Nebari Provider (aws, none)	1m 14s
Test Nebari Provider (aws, github-actions)	1m 6s
Test Nebari Provider (aws, github-actions)	1m 6s
Test Nebari Provider (aws, gitlab-ci)	1m 10s
Test Nebari Provider (aws, gitlab-ci)	1m 10s
Test Nebari Provider (azure, none)	1m 19s
Test Nebari Provider (azure, none)	1m 19s
Test Nebari Provider (azure, github-actions)	1m 23s
Test Nebari Provider (azure, github-actions)	1m 23s
Test Nebari Provider (azure, gitlab-ci)	54s
Test Nebari Provider (azure, gitlab-ci)	54s
Test Nebari Provider (gcp, none)	1m 12s
Test Nebari Provider (gcp, none)	1m 12s
Test Nebari Provider (gcp, github-actions)	1m 22s
Test Nebari Provider (gcp, github-actions)	1m 22s
Test Nebari Provider (gcp, gitlab-ci)	1m 16s
Test Nebari Provider (gcp, gitlab-ci)	1m 30s
Test Nebari Provider (local, none)	1m 9s
Test Nebari Provider (local, none)	1m 9s
Test Nebari Provider (local, github-actions)	55s
Test Nebari Provider (local, github-actions)	55s
Test Nebari Provider (local, gitlab-ci)	56s
Test Nebari Provider (local, gitlab-ci)	56s
Test Nebari Provider (existing, none)	54s
Test Nebari Provider (existing, none)	54s
Test Nebari Provider (existing, github-actions)	1m 8s
Test Nebari Provider (existing, github-actions)	1m 8s
Test Nebari Provider (existing, gitlab-ci)	1m 10s
Test Nebari Provider (existing, gitlab-ci)	1m 10s
	34m 30s

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