Use multiple accounts

[sobolk]

Problem

E2E test load is running into throttling problems.

Issue number, if available:
#1821

Changes

Add 2 more accounts. In such a way that:

1. An array with strings containing account numbers is defined as "Action variable" (see https://docs.github.com/en/actions/writing-workflows/choosing-what-your-workflow-does/store-information-in-variables)
2. Cleanup job is using that list to add second dimension to and generate cleanup jobs per account and region
3. Health check workflow is randomly selecting account for each step that requires it

Out of scope

1. Canaries are not included in this PR.
2. I tried extracting action, but ended up with similar amount of code per each step. So I backed out from that approach.

Corresponding docs PR, if applicable:

Validation

1. https://github.com/aws-amplify/amplify-backend/actions/runs/10423731736/job/28871034297
2. This PR checks.

Seems that accounts are being selected.

Checklist

• If this PR includes a functional change to the runtime behavior of the code, I have added or updated automated test coverage for this change.
• If this PR requires a change to the Project Architecture README, I have included that update in this PR.
• If this PR requires a docs update, I have linked to that docs PR above.
• If this PR modifies E2E tests, makes changes to resource provisioning, or makes SDK calls, I have run the PR checks with the run-e2e label set.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

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