PYCBC-1677: Increase documents created for subdoc tests

Change-Id: I2016eb0dbac17a8d21116f16573f9df23ae83ff1
Reviewed-on: https://review.couchbase.org/c/couchbase-python-client/+/225389
Tested-by: Build Bot <build@couchbase.com>
Reviewed-by: Dimitris Christodoulou <dimitris.christodoulou@couchbase.com>

Author: thejcfactor

tests/environments/subdoc_environment.py

@@ -107,7 +107,7 @@ def load_data(self):  # noqa: C901
                     print(ex)
                     raise
 
-        for v in self.data_provider.get_vehicles()[:50]:
+        for v in self.data_provider.get_vehicles()[:100]:
             for _ in range(3):
                 try:
                     key = f'{v["id"]}'