[builds-api]: Add prometheus
- Add prometheus
- create a Metrics handler to handle requests to metrics endpoint
- minor house-keeping changes
Bug: T337390 Signed-off-by: Ndibe Raymond Olisaemeka rolisaemeka-ctr@wikimedia.org
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Bug: T337390 Signed-off-by: Ndibe Raymond Olisaemeka rolisaemeka-ctr@wikimedia.org