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/yousign.yaml

@@ -0,0 +1,31 @@
+---
+version: 2
+interactions:
+    - id: 0
+      request:
+        proto: HTTP/1.1
+        proto_major: 1
+        proto_minor: 1
+        content_length: 0
+        host: api.yousign.app
+        form:
+            limit:
+                - "100"
+        headers:
+            Accept:
+                - application/json
+        url: https://api.yousign.app/v3/users?limit=100
+        method: GET
+      response:
+        proto: HTTP/2.0
+        proto_major: 2
+        proto_minor: 0
+        content_length: -1
+        uncompressed: true
+        body: '{"meta":{"next_cursor":null},"data":[{"id":"9a93d3b5-fb3b-4abf-9e70-26315b33506c","first_name":"John","last_name":"Doe","email":"john.doe@example.com","locale":"en","job_title":"Legal Counsel","is_active":true,"created_at":"2024-01-18T22:59:00Z","role":"admin","status":"verified"},{"id":"b2f4e1c8-6d3a-4e2b-8f1a-9d5c7e8a0b3f","first_name":"Marie","last_name":"Martin","email":"marie.martin@example.com","locale":"fr","job_title":"Sales Manager","is_active":false,"created_at":"2024-03-02T09:15:00Z","role":"member","status":"invited"}]}'
+        headers:
+            Content-Type:
+                - application/json
+        status: 200 OK
+        code: 200
+        duration: 100ms