Fix Management API tests for Cassandra 3.11

[emerkle826]

With the most recent release of Management API (v0.1.88), Cassandra 3.11 jars are no longer being produced. This results in some test failures:

  Scenario Outline: Perform differential backups over gRPC , verify its index, then delete it over gRPC with management API -- @1.1 Local storage
    Given I have a fresh ccm cluster with mgmt api "with_client_encryption" named "scenario18" ... failed in 21.843s
Traceback (most recent call last):
  File "/home/runner/.cache/pypoetry/virtualenvs/cassandra-medusa-Fb2Ow6Sl-py3.9/lib/python3.9/site-packages/behave/model.py", line 1329, in run
    match.run(runner.context)
  File "/home/runner/.cache/pypoetry/virtualenvs/cassandra-medusa-Fb2Ow6Sl-py3.9/lib/python3.9/site-packages/behave/matchers.py", line 98, in run
    self.func(context, *args, **kwargs)
  File "features/steps/integration_steps.py", line 384, in _i_have_a_fresh_ccm_cluster_with_mgmt_api_running
    get_mgmt_api_jars(version=context.cassandra_version)
  File "features/steps/integration_steps.py", line 1807, in get_mgmt_api_jars
    symlink_mgmt_api_jar(version)
  File "features/steps/integration_steps.py", line 1819, in symlink_mgmt_api_jar
    assert Path('/tmp/management-api-agent-3.x/target/datastax-mgmtapi-agent-3.x-0.1.0-SNAPSHOT.jar').is_file()
AssertionError

To fix this, we can have the test setup pull the last supported version of the Cassandra 3.11 agent jar, which would be version v0.1.87

┆Issue is synchronized with this Jira Story by Unito
┆Issue Number: MED-103