[cristim]

Follow-up to merged PR #539 (closes #378 properly)

PR #539 changed parseMemoryDBDetails to read rec.ResourceType and error
loudly when it is empty, on the premise (stated in the doc comment) that the
AWS SDK has no MemoryDB sub-struct in ReservationPurchaseRecommendationDetail.

That premise is incorrect. The Cost Explorer SDK in use
(costexplorer@v1.61.0) exposes
details.InstanceDetails.MemoryDBInstanceDetails with NodeType and Region,
exactly the shape ElastiCache and Redshift already read from.

The residual bug

Nothing upstream populates rec.ResourceType before parseMemoryDBDetails
runs: parseRecommendationDetail only sets ResourceType inside each
service parser. So for MemoryDB, rec.ResourceType was always "" at entry
and every MemoryDB recommendation hit the empty-ResourceType error and was
skipped. The happy-path branch and its two unit tests (which injected
ResourceType manually) were unreachable in production.

The fix

• Read NodeType and Region from MemoryDBInstanceDetails, mirroring the
  ElastiCache/Redshift parsers, so the happy path is reachable for real CE
  responses.
• Keep a loud error only when the sub-struct or its NodeType is genuinely
  absent.
• Rewrite the tests to exercise the real production path via the SDK struct
  instead of a manually injected ResourceType, adding coverage for the
  missing-sub-struct and nil-NodeType error cases plus Region parsing.

Verification

• gofmt, go vet, go build ./...: clean.
• go test ./providers/aws/recommendations/...: 290 passed.
• SKIP=terraform_validate pre-commit run --files ...: all hooks pass.

(One unrelated pre-existing failure in providers/aws/services/savingsplans
test exists on the base branch and is untouched by this PR.)

Summary by CodeRabbit

• Bug Fixes

  • Improved accuracy of AWS MemoryDB recommendation parsing by deriving offering details directly from Cost Explorer data
  • Enhanced validation and error handling for missing or invalid MemoryDB instance configurations
  • Corrected resource type and region assignment for MemoryDB recommendations

• Tests

  • Expanded test coverage for MemoryDB parsing scenarios and error conditions

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[cristim]

Rebased on feat/multicloud-web-frontend. Resolved conflicts in providers/aws/recommendations/parser_services.go and providers/aws/recommendations/parser_services_test.go (HEAD had a prior intermediate version of parseMemoryDBDetails; kept the PR's version which wires NodeType from CE InstanceDetails, restored _ context.Context to satisfy serviceParserFunc signature). CR BILLING_BLOCKED; no re-trigger sent.