Enhance npm publishing workflows

[danyalaytekin]

Candidates:

• extract publishing workflows, given the current similarity in their YAML, from repos where they have proven to be stable, with parameterisation where necessary
• add more guards to the publishing workflows to protect against developer error; for example:
  • add a hard dependency on the result of the corresponding test workflow
  • or simply run it as a prerequisite despite potential GA usage in normal circumstances, to cover a scenario where a publish took place a significant time after a merge
• consider removing the created and edited event subtypes if useful support for them does not appear to be approaching in GA