Add Scaleway, Yousign, Railway and Crisp access-review connectors

Four API-key, single-tenant (Pattern 3) connectors:

- Scaleway: secret key in the X-Auth-Token header plus an Organization ID
  setting; GET /iam/v1alpha1/users (owner/member, status, two-factor),
  per-connection BuildProbeURL.
- Yousign: Bearer API key; GET /v3/users (admin/owner/member, is_active);
  production host with a static probe.
- Railway: Bearer account token; GraphQL me{workspaces{members}} aggregated
  and deduplicated across workspaces; custom probe, since Railway returns
  HTTP 200 with an errors body on a rejected token.
- Crisp: plugin token as HTTP Basic (identifier:key) plus a Website ID
  setting and the X-Crisp-Tier header; GET /v1/website/{id}/operators/list,
  custom probe and name resolver.

Scaleway and Crisp carry a required extra setting, so the console add-source
dialog maps organizationId/websiteId onto their scalewayOrganizationId and
crispWebsiteId API-key inputs; without that mapping the value is silently
dropped and the create is rejected.

Cassette-backed driver tests plus unit tests for the cross-workspace
deduplication, the probe contracts and the role/MFA helpers.

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

pkg/accessreview/drivers/testdata/crisp.yaml

@@ -0,0 +1,30 @@
+---
+version: 2
+interactions:
+    - id: 0
+      request:
+        proto: HTTP/1.1
+        proto_major: 1
+        proto_minor: 1
+        content_length: 0
+        host: api.crisp.chat
+        headers:
+            Accept:
+                - application/json
+            X-Crisp-Tier:
+                - plugin
+        url: https://api.crisp.chat/v1/website/1a2b3c4d-5e6f-7a8b-9c0d-1e2f3a4b5c6d/operators/list
+        method: GET
+      response:
+        proto: HTTP/2.0
+        proto_major: 2
+        proto_minor: 0
+        content_length: -1
+        uncompressed: true
+        body: '{"error":false,"reason":"listed","data":[{"type":"member","details":{"user_id":"5c068745-c7da-4b59-89a0-1b67f3b0d6df","email":"alex@example.com","first_name":"Alex","last_name":"Martin","role":"owner","title":"Founder","availability":"online","has_token":false}},{"type":"member","details":{"user_id":"9a1f3c2e-6b4d-4f8a-bc11-7d2e9f0a1b22","email":"jordan@example.com","first_name":"Jordan","last_name":"Lee","role":"member","title":"Support Agent","availability":"away","has_token":false}}]}'
+        headers:
+            Content-Type:
+                - application/json
+        status: 200 OK
+        code: 200
+        duration: 100ms