Use teuthology-kill command instead of teuthology.kill.main function

[VallariAg]

To test this PR, setup teuthology-api inside the teuthology container.

1. Add instructions in teuthology dockerfile to setup t-api inside the teuthology container:

   SHELL ["/bin/bash", "-c"] 
   WORKDIR /
   RUN git clone -b use-kill-cmd https://github.com/ceph/teuthology-api && \
   cd /teuthology-api/ && \
   python3 -m venv venv && source ./venv/bin/activate && pip install -e . && \
   export TEUTHOLOGY_API_SERVER_PORT=8083 && \
   exit
   WORKDIR /teuthology
   ....

2. In docker-compose file, expose TEUTHOLOGY_API_SERVER_PORT for teuthology service:

   teuthology:
   ports:
     - 8083:8083

3. Start the containers

4. exec into the teuthology container and run these commands:

   cd /teuthology-api
   source ./venv/bin/activate
   <add your teuthology-api's .env file>
   uvicorn teuthology_api.main:app --reload --port 8083 --host 0.0.0.0

5. Schedule a run on /suite route, using the README payload.

6. Then kill by pressing "Kill Run" button of https://github.com/ceph/pulpito-ng/pull/51

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Checklist

• [x] Changes tested in container setup
• [ ] Changes tested in non-containerized setup
• [x] Includes tests
• [x] Documentation updated