[CI] Deprecate services workflow on Buildkite/GH Actions

Summary: We gave each service their own workflow to enable higher concurrency with autoscaling instances. As a result, the services workflow is now redundant/unnecessary and can be removed.

Test Plan: NA

Reviewers: def-au1t, palys-swm, yayabosh

Reviewed By: palys-swm, yayabosh

Subscribers: ashoat, Adrian, karol-bisztyga

Differential Revision: https://phab.comm.dev/D4407