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/railway.yaml

@@ -0,0 +1,31 @@
+---
+version: 2
+interactions:
+    - id: 0
+      request:
+        proto: HTTP/1.1
+        proto_major: 1
+        proto_minor: 1
+        content_length: 117
+        host: backboard.railway.com
+        body: '{"query":"query { me { id name email workspaces { id name members { id email name role twoFactorAuthEnabled } } } }"}'
+        headers:
+            Accept:
+                - application/json
+            Content-Type:
+                - application/json
+        url: https://backboard.railway.com/graphql/v2
+        method: POST
+      response:
+        proto: HTTP/2.0
+        proto_major: 2
+        proto_minor: 0
+        content_length: -1
+        uncompressed: true
+        body: '{"data":{"me":{"id":"8f7e6d5c-4b3a-2910-8a7b-6c5d4e3f2a1b","name":"Ada Lovelace","email":"ada@example.com","workspaces":[{"id":"3c1d9e8f-7a6b-5c4d-3e2f-1a0b9c8d7e6f","name":"Probo","members":[{"id":"8f7e6d5c-4b3a-2910-8a7b-6c5d4e3f2a1b","email":"ada@example.com","name":"Ada Lovelace","role":"ADMIN","twoFactorAuthEnabled":true},{"id":"1b2c3d4e-5f6a-7b8c-9d0e-1f2a3b4c5d6e","email":"grace@example.com","name":"Grace Hopper","role":"MEMBER","twoFactorAuthEnabled":false}]}]}}}'
+        headers:
+            Content-Type:
+                - application/json
+        status: 200 OK
+        code: 200
+        duration: 100ms