TUN-6935: Cloudflared should use APIToken instead of serviceKey

This commit makes cloudflared use the API token provided during login
instead of service key.
In addition, it eliminates some of the old formats since those are
legacy and we only support cloudflared versions newer than 6 months.

certutil/test-cloudflare-tunnel-cert-json.pem

@@ -0,0 +1,57 @@
+-----BEGIN PRIVATE KEY-----
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+-----END PRIVATE KEY-----
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
+-----BEGIN ARGO TUNNEL TOKEN-----
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+-----END ARGO TUNNEL TOKEN-----