CCM-12950: Add Functional Tests for Events

[Namitha-Prabhu]

Description

Context

Type of changes

• Refactoring (non-breaking change)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would change existing functionality)
• Bug fix (non-breaking change which fixes an issue)

Checklist

• I am familiar with the contributing guidelines
• I have followed the code style of the project
• I have added tests to cover my changes
• I have updated the documentation accordingly
• This PR is a result of pair or mob programming
• If I have used the 'skip-trivy-package' label I have done so responsibly and in the knowledge that this is being fixed as part of a separate ticket/PR.

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Sensitive Information Declaration

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• I confirm that neither PII/PID nor sensitive data are included in this PR and the codebase changes.

[Copilot]

Pull request overview

Adds new functional/component test coverage around the Event Subscription (SNS) flow, alongside a few sandbox test expectation fixes and supporting test infrastructure updates.

Changes:

• Introduces component tests that publish prepared-letter CloudEvents to SNS and validate downstream allocation/upsert behavior via API + CloudWatch Logs polling.
• Updates sandbox test cases to align expected HTTP statuses (e.g., 202 on update, 404 for missing letter).
• Adds supporting helpers/deps (SNS publish helper, CloudWatch polling helper, fixtures) and wires in a sandbox test target/test type.

Reviewed changes

Copilot reviewed 13 out of 15 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
tests/component-tests/events-tests/event-subscription.spec.ts	New SNS event subscription component tests covering success, invalid status, and duplicate events.
tests/helpers/send-sns-event.ts	Helper to publish events to SNS topic for tests.
tests/helpers/aws-cloudwatch-helper.ts	Helper to poll CloudWatch Logs for allocator/upsert processing evidence.
tests/helpers/event-fixtures.ts	Event payload fixture builder for prepared v1 CloudEvents.
tests/constants/api-constants.ts	Adds SNS topic name constant used by event tests/helpers.
tests/constants/request-headers.ts	Allows overriding supplier id when creating request headers (needed for allocator-derived supplier).
tests/sandbox/update-letter-status.spec.ts	Adjusts sandbox update-letter-status spec assertions.
tests/sandbox/testCases/update-multiple-status-test-cases.ts	Updates expected status from 200 to 202 for multi-status update.
tests/sandbox/testCases/get-letter-status-test-cases.ts	Fixes missing-letter expected status to 404.
tests/package.json	Adds CloudWatch Logs SDK dependency for new helper.
tests/e2e-tests/poetry.lock	Dependency bump for authlib.
.github/actions/test-types.json	Adds sandbox as a recognized test type.
Makefile	Adds test-sandbox target and modifies e2e proxy-name used by test command.
package.json	Adds an override for transitive dependency resolution.
package-lock.json	Lockfile updates for AWS SDK / related dependencies and new CloudWatch Logs client.

[Copilot]

Pull request overview

Copilot reviewed 18 out of 22 changed files in this pull request and generated 3 comments.