Remove stored credit card data from checkout and ordering

[Soumilgit]

Summary

• replace checkout/order card fields with a non-sensitive payment method reference
• stop storing payment card details in Ordering and Identity database schemas
• remove card details from identity claims, sample data, logs, web checkout, and client mock/order payloads
• add migrations and update unit/functional test payloads for the new contract

Verification

• dotnet restore eShop.Web.slnf
• dotnet build eShop.Web.slnf --no-restore
• dotnet test tests\Ordering.UnitTests\Ordering.UnitTests.csproj --no-build

Notes

• Ordering functional tests currently time out during Aspire/DCP startup before API test bodies execute in this local environment.

Addresses #979

[Soumilgit]

@dotnet-policy-service agree

[Soumilgit]

Hi @davidfowl,
Please review this PR.