fix: 1210 Langflow OpenSearch Ingestion AuthorizationException Issue

[richardz403]

This PR fixes #1210, a Langflow ingestion auth issue in non-IBM OpenRAG deployments.

Previously, Langflow ingestion requests could reach OpenSearch without explicit credentials, causing the OpenSearch component to execute searches as the anonymous user and fail with 403 security_exception during file ingestion.

This change updates Langflow header injection so that, in non-IBM mode, ingestion requests always include the configured OpenSearch basic auth globals (OPENSEARCH_USERNAME and OPENSEARCH_PASSWORD). That ensures the Langflow OpenSearch component authenticates correctly instead of falling back to anonymous access.

Fixes 403 ingestion failures caused by anonymous OpenSearch _search requests
Affects Langflow-based ingestion in non-IBM/no-auth deployments
Does not change IBM auth behavior.

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