Simplify CI workflows: remove legacy GOPATH checkout pattern

[aravindtga]

Description

• What changed:

  • Removed the legacy GOPATH-style checkout layout (path: go/src/github.com/kptdev/kpt), the top-level GOPATH env variable, and all associated working-directory directives from 6 workflow files.
  • Simplified actions/setup-go@v6 configuration by dropping explicit cache: true and cache-dependency-path where defaults suffice.
  • Retained cache-dependency-path: api/go.sum in release-api.yml for the submodule.
  • Fixed deprecated ::set-output in release.yml with $GITHUB_OUTPUT.
  • Removed workdir from goreleaser/goreleaser-action@v6 in release.yml.

• Why it's needed: The project uses Go modules, the GOPATH checkout layout is unnecessary legacy from the pre-modules era. It adds verbosity and fragility to every workflow. The ::set-output deprecation will eventually break release builds.

• How it works: With Go modules, go commands work from any directory containing go.mod. Checking out to the default workspace root eliminates the need for custom paths and working-directory overrides.

Type of Change

• Refactor

Checklist

• Code follows project style guidelines
• Self-reviewed changes
• Tests added/updated
• Documentation added/updated
• All tests and gating checks pass

AI Disclosure

• I have used AI in the creation of this PR.

If so, please describe how:
- Kiro to identify the unnecessary GOPATH pattern across all workflow files and to generate PR message.

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[Copilot]

Pull request overview

This PR refactors the GitHub Actions CI/release workflows to remove the legacy GOPATH-style checkout layout and associated working-directory overrides, relying on standard Go modules behavior from the repository root.

Changes:

• Removed GOPATH-style checkout paths and working-directory directives across multiple workflows so jobs run from the default workspace root.
• Simplified actions/setup-go@v6 configuration by using go-version-file paths relative to the repo root and dropping explicit cache settings where not needed.
• Updated the release workflow to replace deprecated ::set-output usage with $GITHUB_OUTPUT and removed the GoReleaser action workdir.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
.github/workflows/verifyContent.yml	Drops GOPATH checkout path and runs build/verify steps from repo root with go-version-file: go.mod.
.github/workflows/release.yml	Removes GOPATH checkout/workdir usage and replaces deprecated step output with $GITHUB_OUTPUT.
.github/workflows/release-api.yml	Switches API release workflow to repo-root checkout while still targeting the api/ module via go-version-file.
.github/workflows/live-e2e.yml	Removes GOPATH checkout and working-directory, running e2e from repo root.
.github/workflows/go.yml	Removes top-level GOPATH env and GOPATH-based checkout paths for Linux/macOS jobs.
.github/workflows/e2eEnvironment.yml	Removes GOPATH checkout and working-directory, running e2e from repo root.

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