feat(bootstrap): add Central otel credentials options

[BBesrour]

CU-869d79gqh

Adds possibility to pass central otel creds. Need to send traces to central collector (deployed on dc0) so that they are viewable in central grafana.

Related PRs:

• https://github.com/codesphere-cloud/charts/pull/554
• https://github.com/codesphere-cloud/codesphere-monorepo/pull/19336

[jonas-zipprick]

Task linked: CU-869d79gqh PC: (io11y) Add traces for better debugging

[Copilot]

Pull request overview

Adds support to pass Central OpenTelemetry (central collector) credentials through the GCP bootstrap flow so traces/spans can be exported to a central collector and viewed in central Grafana.

Changes:

• Extend install config schema with Monitoring.CentralOtel and add vault secret extraction for its credentials.
• Add GCP bootstrap CLI flags (--central-otel-username/--central-otel-password) and populate install config when both are provided.
• Add Ginkgo tests for the GCP bootstrap install-config population behavior and update CLI docs.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
internal/installer/files/config_yaml.go	Adds CentralOtel config type/field and writes central otel creds into the vault during secret extraction.
internal/bootstrap/gcp/install_config.go	Populates Cluster.Monitoring.CentralOtel from bootstrap inputs when both creds are present.
internal/bootstrap/gcp/install_config_test.go	Adds tests covering CentralOtel env var combinations and expected install-config outcome.
internal/bootstrap/gcp/gcp.go	Extends bootstrap environment struct with CentralOtel username/password fields.
cli/cmd/bootstrap_gcp.go	Adds CLI flags to accept CentralOtel credentials.
docs/oms_beta_bootstrap-gcp.md	Documents the new CLI flags in the command reference.

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