refactor bootstrap gcp

[siherrmann]

ClickUp: https://app.clickup.com/t/869butx8c

[Copilot]

Pull request overview

This PR refactors the GCP bootstrap functionality by reorganizing code into separate packages and introducing improved abstractions for better testability and maintainability.

Changes:

• Moved GCP-specific bootstrap code from internal/bootstrap/gcp.go to a dedicated internal/bootstrap/gcp package
• Extracted GCP client functionality into a separate interface and implementation
• Refactored node management to use an interface-based approach for better testability
• Added utility functions for string truncation and path expansion
• Introduced a step logger for better user feedback during bootstrap operations

Reviewed changes

Copilot reviewed 16 out of 16 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
internal/util/string.go	Added string truncation utility function
internal/util/path.go	Added path expansion utility for handling tilde in paths
internal/installer/node/node.go	Refactored Node to use interface pattern and encapsulate jumpbox logic
internal/installer/node/mocks.go	Generated mock implementations for NodeManager interface
internal/installer/config_manager_profile.go	Removed profile application log statements
internal/bootstrap/ovh/ovh.go	Added stub for OVH bootstrapper
internal/bootstrap/gcp_client.go	Deleted - moved to gcp package
internal/bootstrap/gcp/mocks.go	Generated mock implementations for GCPClientManager interface
internal/bootstrap/gcp/gcp_client.go	Moved GCP client implementation to gcp package with improved structure
internal/bootstrap/gcp/gcp.go	Moved GCP bootstrapper implementation to gcp package
internal/bootstrap/gcp/bootstrap_suite_test.go	Added test suite setup for gcp package
internal/bootstrap/gcp.go	Deleted - moved to gcp package
internal/bootstrap/bootstrap_stepper.go	Added step logger for user-friendly progress indication
cli/cmd/bootstrap_gcp.go	Updated to use new gcp package structure
.mockery.yml	Added mock generation configuration for new interfaces

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