Modify ssl verification in druid operator

[danielbe11]

• This PR corrects the implementation problems in Adding optional SSL verification for druid operator #37629.
• Makes DruidOperator accept only a boolean to verify SSL when submitting indexing job. By default SSL verification is True which makes it backwards compatible as this is what is default here.
• If DruidOperator is initialised with verify_ssl=False, then the extra property of the Druid connection is checked for verify key which can be set as the path to CA bundle.
• Cache property for the return value of self.get_connection(self.druid_ingest_conn_id) which is called >1 times.

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[dirrao]

Can you add the test case for this change?

[danielbe11]

@dirrao the backwards compatibility and get_verify method are tested, I will add a small test for 'conn' method today

[danielbe11]

@dirrao the backwards compatibility and get_verify method are tested, I will add a small test for 'conn' method today

I have added test_conn_property