fix(error-reporting): silence SeerError on self-hosted (CLI-1WP)

[sentry]

This PR addresses issue CLI-1WP, where SeerError: Seer is not enabled for this organization. was being reported to Sentry for self-hosted instances.

Problem:
When sentry issue explain or sentry issue plan is run against a self-hosted Sentry instance where Seer is disabled, the CLI receives a 403 HTTP response. This is converted into a SeerError('not_enabled'). Because SeerError extends CliError (not ApiError), and classifySilenced() had no specific handling for SeerError, these expected feature-gate conditions were being captured as Sentry issues, polluting the issue tracker. For self-hosted users, Seer cannot be enabled or trialed, making these reports unactionable noise.

Solution:

1. Added "seer_unavailable_self_hosted" to the SilenceReason union type in packages/cli/src/lib/error-reporting.ts.
2. Modified classifySilenced() to return this new reason when a SeerError occurs and the CLI is not pointed at a SaaS (sentry.io) instance. This ensures that the error is silenced only for self-hosted environments.
3. Added a seer_reason attribute to the cli.error.silenced metric when a SeerError is silenced. This allows tracking the volume of these events without creating Sentry issues.
4. Ensured that SeerErrors on SaaS instances continue to be captured, as this is an intentional signal for marketing dashboards.
5. Added unit tests to verify that SeerErrors are silenced on self-hosted configurations and captured on SaaS, and that the correct metric attributes are emitted.

This change prevents expected feature-gate conditions on self-hosted Sentry from being reported as CLI errors, while preserving the intended capture behavior for SaaS environments.

Fixes CLI-1WP

_{@sentry <feedback>: Autofix iterates on these changes
@sentry stop iterating: Autofix stops iterating on this run}

_{This PR was automatically generated by Sentry. You can adjust this setting at any time.}

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Project	Deployment	Actions	Updated
cli	Ready	Preview	Sep 30, 2026 10:44am UTC

1 Skipped Deployment

Project	Deployment	Actions	Updated
sentry-local	Skipped		Sep 30, 2026 10:44am UTC