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 pages/Run/index.tsx: Add kill run button pulpito-ng#51

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Checklist

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

[zmc]

Looks good! Only suggestions are around variable naming.