fix: Send request origin in AgentQL request Headers

[wjwjtf]

This pull request includes a small change to the src/backend/base/langflow/components/agentql/agentql_api.py file. The change adds a new header to the build_output method to specify the request origin.

src/backend/base/langflow/components/agentql/agentql_api.py: Added the "X-TF-Request-Origin": "langflow" header to the headers dictionary in the build_output method.

Replacing #6734

[codspeed-hq]

CodSpeed Performance Report

Merging #6833 will degrade performances by 29.26%

_{Comparing wjwjtf:wenjie/send_request_origin_agentql3 (f46361b) with main (8046008)}

Summary

⚡ 1 improvements
❌ 1 regressions
✅ 17 untouched benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
⚡	test_cancel_build_with_cancelled_error	250.5 ms	87.7 ms	×2.9
❌	test_cancel_nonexistent_build	9 ms	12.7 ms	-29.26%

[edwinjosechittilappilly]

LGTM