Feat: Adds adopt command feature

[rspurgeon]

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[Copilot]

Pull Request Overview

This PR adds a new "adopt" command feature that allows users to apply namespace labels to existing Konnect resources, enabling them to bring previously unmanaged assets under kongctl management.

• Introduces the adopt verb and command structure for managing namespace labels on existing resources
• Implements adoption functionality for four resource types: portals, control planes, APIs, and auth strategies
• Adds comprehensive test coverage including end-to-end test scenario infrastructure with HTTP resource creation capabilities

Reviewed Changes

Copilot reviewed 27 out of 27 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
test/e2e/scenarios/adopt/create-portal-adopt-dump-apply/scenario.yaml	End-to-end test scenario validating the adopt workflow
test/e2e/harness/step.go	Test harness enhancements for HTTP resource creation and environment handling
test/e2e/harness/scenario/types.go	Test scenario type definitions for create operations and variable recording
test/e2e/harness/scenario/run.go	Test scenario execution logic with create command support and output handling
test/e2e/harness/cli.go	CLI test harness improvements for output format control and command capture
internal/cmd/root/verbs/verbs.go	Adds the Adopt verb constant
internal/cmd/root/verbs/adopt/direct.go	Direct adopt command implementations for all resource types
internal/cmd/root/verbs/adopt/adopt.go	Main adopt command structure and subcommand registration
internal/cmd/root/root.go	Registers the adopt command in the root CLI
internal/cmd/root/products/konnect/*.go	Updates existing resource command handlers to support the adopt verb
internal/cmd/root/products/konnect/adopt/*.go	Core adopt implementation with resource-specific logic and comprehensive tests
docs/declarative-configuration.md	Documentation for the new adopt command usage

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