Add TLSMaxVersion, TLSCipherSuites, and TLSCurvePreferences to webhook.Options for minimal tls customization

[jkhelil]

This change adds minimal TLS configuration API for webhooks Add TLSMaxVersion, TLSCipherSuites, and TLSCurvePreferences fields to webhook.Options for granular TLS control without exposing full tls.Config.

• TLSMaxVersion: enforce Modern profile (TLS 1.3 only)
• TLSCipherSuites: custom cipher suites
• TLSCurvePreferences: elliptic curve configuration

Changes:

• Add TLSMaxVersion, TLSCipherSuites, and TLSCurvePreferences fields to webhook.Options
• Added unit tests for all new fields
• Added documentation for webhook tls (README)
• Maintains backward compatibility with existing TLSMinVersion usage

• :gift: Add new feature
• :bug: Fix bug

/kind enhancement

Fixes #3299

Release Note

Enhanced webhook TLS configuration with support for max version, custom cipher suites, and curve preferences.

Docs

[linux-foundation-easycla[bot]]

The committers listed above are authorized under a signed CLA.

• :white_check_mark: login: jkhelil / name: khelil (c6bbfb212318e380134b3a83a2b3e924c93e5457)

[knative-prow[bot]]

Welcome @jkhelil! It looks like this is your first PR to knative/pkg 🎉

[knative-prow[bot]]

Hi @jkhelil. Thanks for your PR.

I'm waiting for a github.com member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[vdemeester]

cc @dprotaso

[twoGiants]

/cc @twoGiants

[dprotaso]

/ok-to-test

[dprotaso]

Change looks good - just see the linter warnings about extra whitespace

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 74.59%. Comparing base (9cc8410) to head (c6bbfb2). :warning: Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3300   +/-   ##
=======================================
  Coverage   74.58%   74.59%           
=======================================
  Files         188      188           
  Lines        8187     8190    +3     
=======================================
+ Hits         6106     6109    +3     
  Misses       1841     1841           
  Partials      240      240           

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[dprotaso]

/lgtm /approve

[knative-prow[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dprotaso, jkhelil

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Needs approval from an approver in each of these files:

• ~~webhook/OWNERS~~ [dprotaso]

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