feat(bootstrap-gcp): Add public keys of specified github team

[NautiluX]

Adds the ability to specify a GitHub team and org. All team member's public keys will be added to created VMs.

Also, updated some variable names for consistent naming (Github vs GitHub)

ClickUp: https://app.clickup.com/t/869cfj7ku

[Copilot]

Pull request overview

Adds support to bootstrap-gcp for fetching SSH public keys from members of a specified GitHub org/team and injecting those keys into the created GCE VMs’ ssh-keys instance metadata.

Changes:

• Introduces a small GitHub client abstraction (real + mock) for listing team members and their SSH keys.
• Extends GCP bootstrap environment/config/CLI flags to accept github-team-org + github-team-slug and wires the GitHub client into the bootstrapper.
• Updates EnsureComputeInstances and tests to include team keys and avoid repeated SSH key file reads.

Reviewed changes

Copilot reviewed 8 out of 9 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
internal/bootstrap/gcp/mocks.go	Adds a mock GitHub client used by bootstrapper tests.
internal/bootstrap/gcp/github_client.go	Adds real GitHub client wrapper + interface used by the bootstrapper.
internal/bootstrap/gcp/gcp_test.go	Updates bootstrapper construction and adds/adjusts tests for GitHub team validation and SSH metadata behavior.
internal/bootstrap/gcp/gcp.go	Adds env fields + validation, injects GitHub client, fetches team keys, and updates SSH metadata generation.
cli/cmd/bootstrap_gcp.go	Adds CLI flags for GitHub team org/slug and wires up the real GitHub client.

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