Modify app cmd

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Pull Request Overview

This PR adds a modify app command for updating application/pipeline parameters and fixes an issue where stack updates could revert parameters to template defaults. Key changes include:

• Introduces cfnparam struct tags for mapping Go field names to CloudFormation parameter names (e.g., RepositoryURL -> RepositoryUrl)
• Updates PruneUnsupportedParameters to use UsePreviousValue for parameters not being explicitly set
• Renames struct fields to follow Go naming conventions (SesDomain -> SESDomain, AppPackRoleExternalID -> AppPackRoleExternalID, etc.)

Reviewed Changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
ui/questions.go	Adds StringValueProxy type for direct string value handling in survey questions
stacks/review_app_test.go	Adds comprehensive test coverage for IsReviewAppName function
stacks/review_app.go	Introduces IsReviewAppName helper function to identify review apps by naming convention
stacks/interfaces_test.go	Adds tests for cfnparam tag mapping and parameter pruning behavior
stacks/interfaces.go	Implements cfnparam tag support for bidirectional CloudFormation parameter mapping and enhances PruneUnsupportedParameters to preserve unmodified parameters
stacks/app_pipeline.go	Renames fields to Go conventions, adds cfnparam tags, extracts reusable question builder functions, and exports VerifySourceCredentials
cmd/modify.go	Implements new modify app command supporting both interactive and flag-based parameter updates with review app protection
cmd/access.go	Updates appOrPipelineStack to initialize with default parameters before loading from CloudFormation
Makefile	Simplifies fmt target to use golangci-lint's built-in formatter
CHANGELOG.md	Documents new features and fixes
.golangci.toml	Configures gofumpt and gci formatters for golangci-lint

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