Add: JiraConn API Test

[AaronMT]

Use unittest to mock a couple basic queries using the JiraConn library.

E.g,

@patch("lib.jira_conn.requests.get")
    def test_get_search_returns_issues_list(self, mock_get):
        # Simulate one page of results with 2 issues
        mock_get.return_value = MagicMock(
            status_code=200,
            json=lambda: {"issues": [{"key": "TEST-1"}, {"key": "TEST-2"}], "isLast": True}
        )
        query = "rest/api/3/search/jql?jql=project=MTE"
        issues = self.client.get_search(query, "issues")
        self.assertEqual([i["key"] for i in issues], ["TEST-1", "TEST-2"])