[builds-api]: Add build cancel endpoint
Depends-on: !38 (merged) Bug: T343606 Signed-off-by: Ndibe Raymond Olisaemeka rolisaemeka-ctr@wikimedia.org
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Depends-on: !38 (merged) Bug: T343606 Signed-off-by: Ndibe Raymond Olisaemeka rolisaemeka-ctr@wikimedia.org