Add support for HTTP header regex replacement

[kenichi-mashiyama]

Summary

This PR adds support for replacing HTTP header values using regular expressions (http-request replace-value) in the HTTPRequestRules across frontends, backends, and listens.

Motivation

Currently, the HAProxy Operator supports setting and deleting HTTP headers, but it lacks the ability to modify existing header values using regular expressions (the native http-request replace-value directive in HAProxy). By introducing the replaceValue field, users can now dynamically rewrite specific parts of HTTP header values based on regex matches directly through the CRDs.

Changes

• Added the ReplaceValue struct and field to HTTPRequestRules in apis/config/v1alpha1/common_types.go.
• Updated the Model() method for HTTP Request Rules to map the new field to the native HAProxy model (Type: "replace-value", along with HdrName, HdrMatch, and HdrFormat).
• Added unit tests in listen_types_test.go to verify the correct generation of the http-request replace-value configuration.
• Regenerated CRDs, DeepCopy methods, and API documentation to reflect the schema updates.

Checklist

• Code changes implemented
• Unit tests added/updated
• Generated CRDs and API docs updated

[xosk31]

Many thanks for your contribution