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/coredata/connector_provider.go

@@ -37,6 +37,7 @@ const (
 	ConnectorProviderOpenAI       ConnectorProvider = "OPENAI"
 	ConnectorProviderPostHog      ConnectorProvider = "POSTHOG"
 	ConnectorProviderSentry       ConnectorProvider = "SENTRY"
+	ConnectorProviderSigNoz       ConnectorProvider = "SIGNOZ"
 	ConnectorProviderSupabase     ConnectorProvider = "SUPABASE"
 	ConnectorProviderGitHub       ConnectorProvider = "GITHUB"
 	ConnectorProviderIntercom     ConnectorProvider = "INTERCOM"
@@ -84,6 +85,7 @@ func ConnectorProviders() []ConnectorProvider {
 		ConnectorProviderOpenAI,
 		ConnectorProviderPostHog,
 		ConnectorProviderSentry,
+		ConnectorProviderSigNoz,
 		ConnectorProviderSupabase,
 		ConnectorProviderGitHub,
 		ConnectorProviderIntercom,
@@ -127,6 +129,7 @@ func (v ConnectorProvider) IsValid() bool {
 		ConnectorProviderOpenAI,
 		ConnectorProviderPostHog,
 		ConnectorProviderSentry,
+		ConnectorProviderSigNoz,
 		ConnectorProviderSupabase,
 		ConnectorProviderGitHub,
 		ConnectorProviderIntercom,