timestamp gitlab ci job outputs (#13605)

* 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

substrate/.gitlab-ci.yml

@@ -113,6 +113,7 @@ variables:
 .kubernetes-env:
   image: "${CI_IMAGE}"
   before_script:
+    - !reference [.timestamp, before_script]
     - !reference [.job-switcher, before_script]
     - !reference [.prepare-env, before_script]
   tags:
@@ -141,6 +142,7 @@ variables:
 .docker-env:
   image: "${CI_IMAGE}"
   before_script:
+    - !reference [.timestamp, before_script]
     - !reference [.job-switcher, before_script]
     - !reference [.prepare-env, before_script]
     - !reference [.rust-info-script, script]
@@ -310,6 +312,8 @@ include:
   - local: scripts/ci/gitlab/default-pipeline.yml
     rules:
       - if: $PIPELINE != "automatic-crate-publishing"
+  - project: parity/infrastructure/ci_cd/shared
+    file: /common/timestamp.yml
 
 #### stage:                        notify