[Bug]: When the same policy attached twice in global policies only latest is applied

[renuka-fernando]

Please select the area the issue is related to

Gateway

Please select the aspect the issue is related to

Aspect/API (API backends, definitions, contracts, interfaces, OpenAPI)

Description

$subject

Steps to Reproduce

1. Create LLM provider.
2. Add set-headers policy
3. Add set-headers again
4. Check the config dump of gateway controller

Severity Level of the Issue

Severity/Blocker (Core functionality is broken and consumer is blocked. Need immediate attention)

Environment Details (with versions)

1.2.0-beta