Define custom headers for AEMaaCS Experience Audit/LightHouse

[#1]

Request for Feature Enhancement (RFE) Summary:	In the Cloud Manager > Pipelines > Exprience Audit, allow to define custom request headers.
Use-case:	This is required for customers using BYOCDN, as we need to provide X-Edge-Key header to access the AEMaaCS publisher.
Current/Experienced Behavior:	Cannot use Experience Audit in BYOCDN setup where AEMaaCS publisher is not publicly available.
Improved/Expected Behavior:	Can use Experience Audit in BYOCDN setup where AEMaaCS publisher is not publicly available.
Environment Details (AEM version/service pack, any other specifics if applicable):	2025.5.21005.20250522T173058Z
Customer-name/Organization name:	Assa Abloy
Screenshot (if applicable):
Code package (if applicable):