[CI] Create workflows templates

[jlabatut]

This issue is a follow-up of issue #2991 (see PR #3514 (comment)).

There is currently a lot of redundancy when running workflows. This could be avoided by using workflow templates, which would also help maintainability.

Example:
https://github.com/opensearch-project/opensearch-dashboards-functional-test/blob/main/.github/workflows/release-e2e-workflow-template.yml#L1

[kavilla]

@jlabatut are you still interested on working this?

Thank you!

[jlabatut]

Hi @kavilla, I'll try to work on this during summer, but if you need it faster, feel free to reassign it to someone else 🙂