feat: Add SchemeHeaderTransformation to ClientTrafficPolicy

[jukie]

What this PR does / why we need it:
Adds the ability to configure SchemeHeaderTransformation inside ClientTrafficPolicy

Which issue(s) this PR fixes:

Fixes #7979

Release Notes: Yes

I validate that this change makes it possible to run a gRPC .NET service with gateway TLS termination

[netlify]

✅ Deploy Preview for cerulean-figolla-1f9435 canceled.

Name	Link
🔨 Latest commit	d00a3c7
🔍 Latest deploy log	https://app.netlify.com/projects/cerulean-figolla-1f9435/deploys/696b28967d454c00081b26f1

[codecov]

Codecov Report

❌ Patch coverage is 90.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.82%. Comparing base (d0f72f6) to head (d00a3c7).

Files with missing lines	Patch %	Lines
internal/xds/translator/listener.go	86.66%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7980   +/-   ##
=======================================
  Coverage   72.82%   72.82%           
=======================================
  Files         237      237           
  Lines       35475    35495   +20     
=======================================
+ Hits        25835    25851   +16     
- Misses       7801     7805    +4     
  Partials     1839     1839           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[jukie]

/retest

[arkodg]

@jukie this is same as #7842 but does it in CTP because its a HCM setting ?

[jukie]

Nice I hadn't seen that! I even reviewed it 🤦.

Yeah it's the same and I can close mine in favor of it but that one is missing the explicit override field.

[jukie]

Correction, this is a listener level setting so adding to BTP isn't right.

[arkodg]

Correction, this is a listener level setting so adding to BTP isn't right.

yeah can we highlight this in the other issue, and steer it in the right direction