improve postman workflow tests

[dario-daza]

Proposed Changes

• Added GET /api/v1/workflow/schemes/schemes-content-types endpoint (findAllSchemesByContentTypeList) that accepts a comma-separated contentTypeIds query parameter and returns workflow schemes grouped by content type
• Created AbstractContentTypeWorkflowSchemesView (Immutables) with contentTypeId + contentTypeSchemes fields, and ResponseEntityContentTypeWorkflowSchemesView as the typed response wrapper
• The endpoint accepts contentTypeIds comma-separated values (?contentTypeIds=id1,id2,id3) rather than repeated params — trims whitespace and filters empty tokens
• Added integration tests in WorkflowResourceResponseCodeIntegrationTest covering: null input, empty string, whitespace-only tokens, IDs with surrounding whitespace, invalid ID (expects 404), happy path with comma-separated valid IDs, and documented repeated-param limitation
• Fix and add postman test to test the Workflow Schemas

Additional Info

The endpoint returns a structured List<{contentTypeId, contentTypeSchemes[]}> rather than a flat deduplicated list - this keeps the association between each content type and its schemes intact and lets the frontend handle deduplication if needed.

This PR fixes: #35471

[claude]

Claude encountered an error after 0s —— View job

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Claude encountered an error after 0s —— View job

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