Add multi-repo upgrade and dependency maintenance utility

[aravindtga]

Description

• What changed: Adds scripts/go-upgrade/ - a modular bash utility for coordinating upgrades across 4 interdependent repositories (krm-functions-sdk, kpt, krm-functions-catalog, porch)
• Why it's needed: Coordinated upgrades across the ecosystem (Go version, linter version, cross-repo dependency pins) require building each module standalone, resolving versions, and verifying compatibility - manual execution is error-prone and slow
• How it works: Clones repos into a local workspace, performs the requested upgrades, verifies each module with go mod tidy / go fmt / go vet / go build (all with GOWORK=off), and optionally creates draft PRs via GitHub GraphQL API

Supported operations:

• go-version - bump Go directive in all go.mod files
• lint-version - bump GOLANGCI_LINT_VERSION in Makefiles
• cross-deps - upgrade cross-repository dependencies to latest published versions
• all - run all of the above in sequence
• push - create branches, commit, push, and raise draft PRs

Type of Change

• New feature
• Documentation

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.

Kiro CLI used to design, implement, and validate the utility including library structure, safety fixes, and GraphQL API integration.

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[Copilot]

Pull request overview

Adds a new scripts/go-upgrade/ bash utility intended to coordinate Go/linter/cross-repo dependency upgrades across the kptdev ecosystem repositories, including optional branch pushing and draft PR creation via GitHub GraphQL.

Changes:

• Introduces upgrade.sh entrypoint with subcommands for Go version bumps, lint version bumps, cross-repo dep updates, doc generation, and pushing PRs.
• Adds modular library scripts (lib/*.sh) for workspace management, verification, version updates, dependency resolution, and PR creation.
• Documents usage and configuration in scripts/go-upgrade/README.md, plus adds config.env defaults.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
scripts/go-upgrade/upgrade.sh	Adds main CLI entrypoint, arg parsing, orchestration, and push flow wiring.
scripts/go-upgrade/README.md	Documents intended usage, options, and workflow for the utility.
scripts/go-upgrade/config.env	Provides default configuration for repos, versions, workspace, and exclusions.
scripts/go-upgrade/lib/common.sh	Adds shared helpers (logging, failure tracking, repo parsing, dependency checks).
scripts/go-upgrade/lib/workspace.sh	Implements clone/reuse workspace behavior, clean-state enforcement, module discovery.
scripts/go-upgrade/lib/verify.sh	Implements per-module verification pipeline (tidy/fmt/vet/build + Hugo handling).
scripts/go-upgrade/lib/versions.sh	Implements go-version, lint-version, and generate-docs subcommands.
scripts/go-upgrade/lib/deps.sh	Implements cross-repo dependency detection and upgrade logic.
scripts/go-upgrade/lib/push.sh	Implements branch/commit/push and GraphQL draft PR creation via gh.

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