* timestamp gitlab ci job outputs
Based on previous work by @alvicsam in #13047.
* inline timestamp script
Some of our jobs don't check out the substrate repo.
* include .timestamp in pipelines overriding the default before_script
Still not including it in the zombienet jobs, they have their own
timestamping anyway.
* move timestamp.yml to shared pipeline repo
https://gitlab.parity.io/parity/infrastructure/ci_cd/shared