Add four API-key access-review connectors

Add Pylon, OpenRouter, incident.io and Brevo as access-review connectors.
All are API-key, single-tenant providers (Pattern 3): the key identifies
one tenant, so there is no OAuth flow, picker UI, or bootstrap/helm
configuration.

- Pylon: Bearer token, GET /users; resolves each user's opaque role_id to
  a role name via GET /user-roles, with cursor pagination.
- OpenRouter: Bearer management key, GET /api/v1/organization/members. The
  endpoint requires an organization account -- a personal key authenticates
  but returns 404 -- so the connection probe rejects 404 on top of 401/403
  (doProbeRequest gained an opt-in extra-reject set) to surface a non-org
  key at connect time instead of mid-campaign.
- incident.io: Bearer token, GET /v2/users. Its OAuth is outbound-only, so
  the API key is the inbound path; live base_role/custom_roles take
  precedence over the deprecated role enum.
- Brevo: API key in the api-key header (Registration.APIKeyHeader), GET
  /v3/organization/invited/users. A live recording corrected the documented
  schema: is_owner is a JSON boolean (not a string) and an id field is
  present, so it is used as the stable ExternalID.

The OpenRouter and Brevo cassettes are anonymized live recordings; Pylon
and incident.io use hand-authored fixtures (no self-serve test tenant). The
shared three-valued active-status mapping is consolidated into
activeFromStatus in driver.go.

Each adds the enum value, migration, GraphQL binding, provider
Registration, a driver with a cassette-driven test, and a brand logo.

Signed-off-by: Aurélien Sibiril <81782+aureliensibiril@users.noreply.github.com>

pkg/accessreview/drivers/testdata/pylon.yaml

@@ -0,0 +1,64 @@
+---
+# Hand-authored fixture for the Pylon access-review driver. The driver first
+# resolves the organization's role catalogue (GET /user-roles), then lists
+# members (GET /users) and maps each user's opaque role_id to a role name.
+# The user/role object shapes mirror the documented OpenAPI schema. Synthetic
+# IDs/emails only.
+version: 2
+interactions:
+    - id: 0
+      request:
+        proto: HTTP/1.1
+        proto_major: 1
+        proto_minor: 1
+        content_length: 0
+        host: api.usepylon.com
+        form:
+            limit:
+                - "100"
+        headers:
+            Accept:
+                - application/json
+        url: https://api.usepylon.com/user-roles?limit=100
+        method: GET
+      response:
+        proto: HTTP/2.0
+        proto_major: 2
+        proto_minor: 0
+        content_length: -1
+        uncompressed: true
+        body: '{"data":[{"id":"role_admin","name":"Admin","slug":"admin"},{"id":"role_member","name":"Member","slug":"member"}],"pagination":{"cursor":"","has_next_page":false},"request_id":"req_roles_1"}'
+        headers:
+            Content-Type:
+                - application/json
+        status: 200 OK
+        code: 200
+        duration: 120ms
+    - id: 1
+      request:
+        proto: HTTP/1.1
+        proto_major: 1
+        proto_minor: 1
+        content_length: 0
+        host: api.usepylon.com
+        form:
+            limit:
+                - "100"
+        headers:
+            Accept:
+                - application/json
+        url: https://api.usepylon.com/users?limit=100
+        method: GET
+      response:
+        proto: HTTP/2.0
+        proto_major: 2
+        proto_minor: 0
+        content_length: -1
+        uncompressed: true
+        body: '{"data":[{"id":"user_1","email":"alice@example.com","name":"Alice Admin","role_id":"role_admin","status":"active"},{"id":"user_2","email":"bob@example.com","name":"Bob Member","role_id":"role_member","status":"active"},{"id":"user_3","email":"carol@example.com","name":"","role_id":"role_member","status":"deactivated"}],"pagination":{"cursor":"","has_next_page":false},"request_id":"req_users_1"}'
+        headers:
+            Content-Type:
+                - application/json
+        status: 200 OK
+        code: 200
+        duration: 140ms