Rename binary to short name

Rename the CLI binary from newrelic-cli to nrq following the ripgrep pattern (descriptive package name, short binary).

Changes required:

• .goreleaser.yml — update binary, builds.id
• Makefile — update BINARY_NAME=nrq
• Rename cmd/newrelic-cli/ → cmd/nrq/
• internal/cmd/root.go — update Cobra Use: field
• README.md — update all command examples
• packaging/chocolatey/newrelic-cli.nuspec — update binary refs (package name stays same)
• packaging/chocolatey/tools/chocolateyInstall.ps1 — update binary name
• packaging/winget/*.yaml — update Commands to nrq
• Add .github/workflows/test-chocolatey.yml (copy from confluence-cli, adapt)
• Homebrew formula updates (in homebrew-tap repo): update bin.install "nrq"

Package name: newrelic-cli (unchanged)

Binary name: nrq

After this change:

• Install: brew install newrelic-cli
• Usage: nrq <command>