Add new plugin for running tests in testing farm

[velezd]

Includes unit tests and fix of stdout reportSender, so we can see the full links to TF artifacts.
For testing I used the plugin the run tests in https://gitlab.cee.redhat.com/zveleba/tf-test repo.

Examples of .tc.yaml execution section:

execution:
  type: testingFarm
  automation_data:
    test: /comps-translations
    test_repo: https://gitlab.cee.redhat.com/zveleba/tf-test.git
    test_branch: main
    compose: RHEL-9.7.0-Nightly
    arch: x86_64
    env_vars:
        TEST_PARAM_TEST: testing

execution:
  type: testingFarm
  automation_data:
    test: /test-basic

[PLukas2018]

LGTM, just one note to smthing I am not certain...