Create GitHub composite action for CI workflow

[leotm]

What is the Problem Being Solved?

Clean up CI tech debt to avoiding duplication, finishing what we started 4y ago

• CI Lint/Test/Test262 workflow #37

endo/.github/workflows/ci.yml

Lines 11 to 14 in df5a0e8

	# This file has necessary redundancies since of github actions aren't supporting:
	# - the definition of macros, which could be called from each job.
	# - reporting the status of steps in the PR (only jobs and workflows are reported).
	# Steps between "begin" and "end" should be the same in every job.

so replace all our begin/end macro comments with a GH composite action

spotted earlier by @boneskull

Description of the Design

e.g. uses: endojs/setup@1.0.0

the alternative is a reusable workflow

Security Considerations

• gha security hardening
• using a commit's sha for release management

Scaling Considerations

this improves scaling CI jobs

Test Plan

Testing out your action in a workflow

local testing works well with nektos/act

Compatibility Considerations

consider: linux / windows / macOS

Upgrade Considerations

upgrading this composite actions to e.g. uses: endojs/setup@1.0.1 involves pushing a new tag

[boneskull]

@leotm Can you make sure that we only lint once? Currently, we're running the lint workflow on multiple versions of Node.js, which wastes cycles