PSCE-420: ci: updates e2e testing workflow to test before image publishing

[jpower432]

Description

With the introduction of rebuilding on a schedule, it is better to test before the image is built to ensure
base image changes do introduce unexpected changes to the environment.

Summary

• Move e2e.yml from a resusable workflow to a composite action to let it be run as a step or job
• Updates ci.yml to use the action with the e2e job
• Adds an optional testing step to the e2e action
• Remove extra tag being created during release (validated w/ act)

Stacked with #220

Type of change

• New feature (non-breaking change which adds functionality)

How has this been tested?

• Tested with GitHub Actions on fork
  https://github.com/jpower432/trestle-bot/actions/runs/9101291255

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[gvauter]

Changes lgtm, I was able to do some basic validation with act locally.