[Test Harness] Generalise Feature files/Scenarios and add ability to platform-scope Scenarios

[DVAlexHiggs]

• Removed duplicated feature files under different platform folders. All feature files/scenarios can now run against all platforms

• To force a scenario/feature file to only run on a specific platform, you can now tag it with the platform name.

  e.g.

  Feature: [BQ-HUB] Hubs
  
  @bigquery # <-----
  @fixture.single_source_hub
  Scenario: [BQ-HUB-01] Simple load of stage data into an empty hub
    Given the HUB table does not exist
    And the RAW_STAGE table contains data
      | CUSTOMER_ID | CUSTOMER_NAME | LOAD_DATE  | SOURCE |
      | 1001        | Alice         | 1993-01-01 | TPCH   |
      | 1001        | Alice         | 1993-01-01 | TPCH   |
      | 1002        | Bob           | 1993-01-01 | TPCH   |
      | 1002        | Bob           | 1993-01-01 | TPCH   |
      | 1002        | Bob           | 1993-01-01 | TPCH   |
      | 1003        | Chad          | 1993-01-01 | TPCH   |
      | 1004        | Dom           | 1993-01-01 | TPCH   |
    And I stage the STG_CUSTOMER data
    When I load the HUB hub
    Then the HUB table should contain expected data
      | CUSTOMER_PK | CUSTOMER_ID | LOAD_DATE  | SOURCE |
      | md5('1001') | 1001        | 1993-01-01 | TPCH   |
      | md5('1002') | 1002        | 1993-01-01 | TPCH   |
      | md5('1003') | 1003        | 1993-01-01 | TPCH   |
      | md5('1004') | 1004        | 1993-01-01 | TPCH   |

[DVAlexHiggs]

Ignore failure on last commit. Cancelled because it was an unnecessary execution (only changed one character in a scenario name)