Add SigNoz access review driver

Add a SigNoz connector so its organization members can be pulled into
access-review campaign snapshots. SigNoz authenticates with a
SIGNOZ-API-KEY admin service-account key and a customer-supplied base
URL (a SigNoz Cloud region/tenant host or a self-hosted instance).

The driver lists users via GET /api/v1/user, which returns the role
(ADMIN/EDITOR/VIEWER) inline so admin detection works in a single call,
and maps the SigNoz user status (active / pending_invite / deleted) to
the account active flag. The name resolver reads the organization
display name from GET /api/v2/orgs/me to title the access source.

Wire the provider through the coredata enum and settings, the
connector-provider registry (driver and name-resolver factories), the
console API-key input schema and validation, the access-review source
label, and the SigNoz brand logo.

Co-authored-by: Bryan FRIMIN <bryan@frimin.fr>
Signed-off-by: Aurélien Sibiril <81782+aureliensibiril@users.noreply.github.com>

pkg/server/api/console/v1/graphql/connector.graphql

@@ -24,6 +24,8 @@ enum ConnectorProvider
     OPENAI @goEnum(value: "go.probo.inc/probo/pkg/coredata.ConnectorProviderOpenAI")
     POSTHOG @goEnum(value: "go.probo.inc/probo/pkg/coredata.ConnectorProviderPostHog")
     SENTRY @goEnum(value: "go.probo.inc/probo/pkg/coredata.ConnectorProviderSentry")
+    SIGNOZ
+        @goEnum(value: "go.probo.inc/probo/pkg/coredata.ConnectorProviderSigNoz")
     SUPABASE
         @goEnum(value: "go.probo.inc/probo/pkg/coredata.ConnectorProviderSupabase")
     GITHUB @goEnum(value: "go.probo.inc/probo/pkg/coredata.ConnectorProviderGitHub")
@@ -133,6 +135,7 @@ input CreateAPIKeyConnectorInput {
     supabaseOrganizationSlug: String
     githubOrganization: String
     grafanaBaseUrl: String
+    signozBaseUrl: String
     onePasswordScimBridgeUrl: String
     metabaseInstanceUrl: String
     posthogRegion: String