[Collections]: Drop default collection using java sdk fails with 'FeatureNotAvailable' exception

Build: 7.0.0-4834

Last working build: 7.0.0-4797

Scenario:

1. Single node cluster
2. Couchbase bucket replica=1
3. Load few docs into the default collection
4. Drop collection using the java sdk call,

   bucketObj.collections().dropCollection(collection_spec)

Observation:

Observing following exception from SDK

FeatureNotAvailableException: com.couchbase.client.core.error.FeatureNotAvailableException: The cluster does not support collections and scopes.

QE test:

bucket_collections.basic_ops.BasicOps:

  test_delete_default_collection,nodes_init=1,client_type=sdk,scope=random,collection=random