Feeding run info for builds and validation runs

[dcoraboeuf]

See nemerosa/ontrack#600.

• [x] Use feature/600-run-info temporary version for development - feature-600-run-info-ccbdb45
• [x] Build publisher
• [x] Validation run publisher
• [x] Step integration for build creation (stage duration)
• [x] Step integration for validation run creation (stage duration)
• [x] Make the run info available for the Ontrack DSL
• [x] Check compatibility (2.35 / 3.35) - for steps, Ontrack DSL and legacy notifiers (needs tmp version feature-600-run-info-04ab67b)
• [x] Use Ontrack 2.35.0
• [x] Version check must be cached
• [x] Gets the commit for a SCM trigger cause
• [x] Testing with a beta version
• [x] Documentation / when it is done / examples of custom script
• [x] Pipeline starting from 2.33
• [x] Backport run info for build/validation notifier to LTS 2.30.3