[services] Remove build-[blob/backup]-base from services/package.json

Summary: We no longer have a base image for blob/backup base. These commands are no longer relevant.

Test Plan: NA, searched codebase

Reviewers: def-au1t, palys-swm, yayabosh, karol-bisztyga

Reviewed By: palys-swm, yayabosh, karol-bisztyga

Subscribers: ashoat, Adrian, karol-bisztyga

Differential Revision: https://phab.comm.dev/D4371