W-19442242 Add docs and setup to debug per-pr e2e tests

[shethj]

Description

As a PWA kit stakeholder, I'd like to make sure my e2e tests pass before I merge in the PR into develop. We have a github actions workflow that runs e2e tests against each PR and blocks merge if the tests fail.

We need to document a way to allow developers to debug test failures by running the e2e tests locally.

This PR enables passing in inputs for MRT Env config that allows developers to recreate e2e test setup on their own MRT Env. With that they can locally run playwright tests against their own MRT instance and need not worry about breaking our testing CI. It also makes sure developers are debugging tests against the same setup that the CI uses.

This PR has a corresponding docs PR in paved-path docs: Paved Path #152

Types of Changes

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Documentation update
• Breaking change (could cause existing functionality to not work as expected)
• Other changes (non-breaking changes that does not fit any of the above)

Breaking changes include:

• Removing a public function or component or prop
• Adding a required argument to a function
• Changing the data type of a function parameter or return value
• Adding a new peer dependency to package.json

Changes

• Added input params to manually run e2e-pr

How to Test-Drive This PR

• See docs: https://git.soma.salesforce.com/commerce/paved-path/pull/152

Checklists

General

• Changes are covered by test cases
• CHANGELOG.md updated with a short description of changes (not required for documentation updates)

Accessibility Compliance

You must check off all items in one of the follow two lists:

• There are no changes to UI

or...

• Changes were tested with a Screen Reader (iOS VoiceOver or Android Talkback) and had no issues
• Changes comply with WCAG 2.0 guidelines levels A and AA
• Changes to common UI patterns and interactions comply with WAI-ARIA best practices

Localization

• Changes include a UI text update in the Retail React App (which requires translation)

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