MPT-17590 Add usage item by default in the purchase wizard

[alephsur]

Closes MPT-17590

• Add AWS_ITEMS_SKUS constant containing "AWS Usage"
• Add add_default_lines(client, order) to fetch product items by SKU and append default order lines (quantity=1)
• Add validate_order(client, order) to orchestrate parameter visibility update and default line injection
• Update extension.py to call validate_order(request.client, order) in order validation endpoint
• Update tests and fixtures to mock and cover validate_order behavior

[coderabbitai]

📝 Walkthrough

Walkthrough

Added a new SKU constant and reworked order validation: extension entry now calls a new validate_order orchestrator which applies parameter visibility then appends default AWS line items by fetching product items via MPTClient.

Changes

Cohort / File(s)	Summary
Constants Definition swo_aws_extension/constants.py	Added AWS_ITEMS_SKUS = ("AWS Usage",) constant.
Validation Orchestration & Client Integration swo_aws_extension/flows/validation/base.py	Added add_default_lines(client, order) and validate_order(client, order); integrated MPTClient and get_product_items_by_skus; adjusted update_parameters_visibility usage and error/log handling; removed unnecessary deep-copy in one path.
Extension Entrypoint swo_aws_extension/extension.py	Replaced call to update_parameters_visibility(order) with validate_order(request.client, order) and updated import.
Tests & Fixtures tests/flows/validation/test_base.py, tests/conftest.py, tests/test_extension.py	Added/updated tests to cover add_default_lines and validate_order; renamed mock fixture from mock_update_parameters_visibility to mock_validate_order and updated usages to match new orchestrator.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Possibly related PRs

• #167: Related changes to order-validation flow and the original update_parameters_visibility implementation referenced by the new orchestrator.
• #176: Overlaps in modifications to swo_aws_extension/flows/validation/base.py and constants for AWS-related validation.
• #190: Edits the same validation module and touches support/type constraint logic that interacts with the new orchestration.

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Jira Issue Key In Title	✅ Passed	The PR title contains exactly one Jira issue key MPT-17590 in the correct format at the beginning.
Test Coverage Required	✅ Passed	PR modifies 3 code files and includes corresponding changes in 3 test files, meeting the requirement for test coverage.
Single Commit Required	✅ Passed	The pull request contains exactly one commit (a01296d: MPT-17590 Add usage item by default in the purchase wizard), satisfying the requirement.

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Warning

Review ran into problems

🔥 Problems

Errors were encountered while retrieving linked issues.

Errors (1)

• MPT-17590: Cannot read properties of undefined (reading 'map')

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud