feat: Part 3 - Update E2E tests for new Build Preset Pipeline

[ishaansehgal99]

In this PR we:

1. Place e2e configuration params in a separate JSON
2. Switch from using a hardcoded env variable for image tag version -> Using support-models.yaml tag as source of truth
3. Prevent empty matrix error during build preset pipeline
4. Test/Prod Image Handling Scenarios (See Below)

Discussion:
This PR addresses three scenarios for image handling:

1. Absent in Test ACR: Logs an error and skips E2E.
2. Present in Test but Absent in Prod ACR: Executes E2E tests (and upon manual trigger and successful E2E, imports the image to Prod)
3. Present in Both Test and Prod ACRs: Currently, E2E tests run without importing.

For the third scenario, to streamline our process and enforce tagging discipline, we could skip E2E tests for images already in Prod, only logging a notice. Thoughts? Want to ensure consensus before finalizing.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (a9c766f) 66.10% compared to head (90cf423) 66.10%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #220   +/-   ##
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  Coverage   66.10%   66.10%           
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  Files          14       14           
  Lines        1372     1372           
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  Hits          907      907           
  Misses        427      427           
  Partials       38       38           

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