chore: Bump Go toolchain references to 1.25.11 across module, CI, and build images [DO NOT MERGE]

[Copilot]

This updates the repository’s Go version to 1.25.11 in the same touchpoints used for prior Go patch upgrades, keeping module, CI, and container build inputs aligned. The goal is to ensure all build/test/publish paths resolve to the same Go patch version.

• Module toolchain

  • Updated go.mod directive from go 1.25.10 to go 1.25.11.

• CI workflow runtime

  • Updated GO_VERSION to 1.25.11 in:
    • .github/workflows/go.yml
    • .github/workflows/e2e-tests.yml
    • .github/workflows/unit-integration-tests.yml
    • .github/workflows/build-publish-mcr.yml
    • .github/workflows/publish-image.yml
    • .github/workflows/trivy.yml

• Container build base images

  • Updated Go builder image tag to 1.25.11 in:
    • docker/hub-net-controller-manager.Dockerfile
    • docker/member-net-controller-manager.Dockerfile
    • docker/mcs-controller-manager.Dockerfile
    • docker/net-crd-installer.Dockerfile

- go 1.25.10
+ go 1.25.11

- GO_VERSION: '1.25.10'
+ GO_VERSION: '1.25.11'

- FROM mcr.microsoft.com/oss/go/microsoft/golang:1.25.10 AS builder
+ FROM mcr.microsoft.com/oss/go/microsoft/golang:1.25.11 AS builder