Activate gunicorn's statsd monitoring for rpc services

Following the work on objstorage's gunicorn rpc statsd activation [1], activate the statsd metrics for other rpc services (relying on gunicorn).

• #1592 (closed): objstorage [1] [2]
• swh/infra/ci-cd/swh-charts!456 (merged): storage [3]
• swh/infra/ci-cd/swh-charts!457 (merged): scheduler
• swh/infra/ci-cd/swh-charts!457 (merged): indexer-storage
• swh/infra/ci-cd/swh-charts!457 (merged): vault
• swh/infra/ci-cd/swh-charts!457 (merged): search
• swh/infra/ci-cd/swh-charts!457 (merged): counter
• swh/infra/ci-cd/swh-charts!457 (merged): graphql
• swh/infra/ci-cd/swh-charts!457 (merged): deposit
• swh/infra/ci-cd/swh-charts!457 (merged): web

[1] #1592 (closed)

[2] https://grafana.softwareheritage.org/goto/fiEl-3rIk?orgId=1

[3] https://grafana.softwareheritage.org/goto/pv9U-qrSz?orgId=1

changed the description

mentioned in commit swh/infra/ci-cd/swh-charts@c9289e81

mentioned in commit swh/infra/ci-cd/swh-charts@87b4fb9b

mentioned in commit swh/infra/ci-cd/swh-charts@f16ca949

mentioned in commit swh/infra/ci-cd/swh-charts@f0e11cb7

mentioned in commit swh/infra/ci-cd/swh-charts@bb488fa6

mentioned in merge request swh/infra/ci-cd/swh-charts!456 (merged)

mentioned in commit swh-apps@00c7ec2e

mentioned in commit swh-apps@ab2ea5fd

changed the description

mentioned in commit swh/infra/ci-cd/swh-charts@9d37ac74

marked the checklist item swh/infra/ci-cd/swh-charts!456 (merged): storage as completed

changed the description

mentioned in commit swh-apps@1d36a11c

mentioned in commit swh/infra/ci-cd/swh-charts@e46faa7d

mentioned in commit swh/infra/ci-cd/swh-charts@d39171e3

mentioned in merge request swh/infra/ci-cd/swh-charts!457 (merged)

marked the checklist item scheduler as completed

changed the description

mentioned in commit swh-apps@a0f4ccbc