fix(federatedfilesharing): get share by token fallback

[backportbot]

Regression from #49646

Reproducing the issue

• Create a federated share
• See the share on receiving server
• Remove the share on emitter server
• See error on both server: entry does not contains @.

Explanations

The code check for the FederatedShareProvider, which have its shares into oc_share.
But on the receiving end, which the ocm notification gets sent, there is no shares in this table.
They're just external shares from the oc_share_external, so we need to fetch and check them too

Error

{
  "reqId": "t4wJRkGxiWXx6g1uJn4Q",
  "level": 2,
  "time": "2024-12-26T12:34:55+00:00",
  "remoteAddr": "172.21.0.2",
  "user": false,
  "app": "cloud_federation_api",
  "method": "POST",
  "url": "/index.php/ocm/notifications",
  "message": "incoming request exception",
  "userAgent": "Nextcloud Server Crawler",
  "version": "31.0.0.6",
  "exception": {
    "Exception": "NCU\\Security\\Signature\\Exceptions\\IncomingRequestException",
    "Message": "entry  does not contains @",
    "Code": 0,
    "Trace": [
      {
        "file": "/var/www/html/apps/cloud_federation_api/lib/Controller/RequestHandlerController.php",
        "line": 435,
        "function": "getHostFromFederationId",
        "class": "OCA\\CloudFederationAPI\\Controller\\RequestHandlerController",
        "type": "->",
        "args": [
          ""
        ]
      },
      {
        "file": "/var/www/html/apps/cloud_federation_api/lib/Controller/RequestHandlerController.php",
        "line": 423,
        "function": "confirmNotificationEntry",
        "class": "OCA\\CloudFederationAPI\\Controller\\RequestHandlerController",
        "type": "->",
        "args": [
          {
            "__class__": "OC\\Security\\Signature\\Model\\IncomingSignedRequest"
          },
          ""
        ]
      },
      {
        "file": "/var/www/html/apps/cloud_federation_api/lib/Controller/RequestHandlerController.php",
        "line": 254,
        "function": "confirmNotificationIdentity",
        "class": "OCA\\CloudFederationAPI\\Controller\\RequestHandlerController",
        "type": "->",
        "args": [
          {
            "__class__": "OC\\Security\\Signature\\Model\\IncomingSignedRequest"
          },
          "file",
          {
            "sharedSecret": "la0KxWqDj08lrUZ",
            "message": "file is no longer shared with you"
          }
        ]
      },
      {
        "file": "/var/www/html/lib/private/AppFramework/Http/Dispatcher.php",
        "line": 200,
        "function": "receiveNotification",
        "class": "OCA\\CloudFederationAPI\\Controller\\RequestHandlerController",
        "type": "->",
        "args": [
          "SHARE_UNSHARED",
          "file",
          "30",
          {
            "sharedSecret": "la0KxWqDj08lrUZ",
            "message": "file is no longer shared with you"
          }
        ]
      },
      {
        "file": "/var/www/html/lib/private/AppFramework/Http/Dispatcher.php",
        "line": 114,
        "function": "executeController",
        "class": "OC\\AppFramework\\Http\\Dispatcher",
        "type": "->",
        "args": [
          {
            "__class__": "OCA\\CloudFederationAPI\\Controller\\RequestHandlerController"
          },
          "receiveNotification"
        ]
      },
      {
        "file": "/var/www/html/lib/private/AppFramework/App.php",
        "line": 161,
        "function": "dispatch",
        "class": "OC\\AppFramework\\Http\\Dispatcher",
        "type": "->",
        "args": [
          {
            "__class__": "OCA\\CloudFederationAPI\\Controller\\RequestHandlerController"
          },
          "receiveNotification"
        ]
      },
      {
        "file": "/var/www/html/lib/private/Route/Router.php",
        "line": 306,
        "function": "main",
        "class": "OC\\AppFramework\\App",
        "type": "::",
        "args": [
          "OCA\\CloudFederationAPI\\Controller\\RequestHandlerController",
          "receiveNotification",
          {
            "__class__": "OC\\AppFramework\\DependencyInjection\\DIContainer"
          },
          {
            "_route": "cloud_federation_api.requesthandler.receivenotification"
          }
        ]
      },
      {
        "file": "/var/www/html/lib/base.php",
        "line": 1019,
        "function": "match",
        "class": "OC\\Route\\Router",
        "type": "->",
        "args": [
          "/ocm/notifications"
        ]
      },
      {
        "file": "/var/www/html/index.php",
        "line": 24,
        "function": "handleRequest",
        "class": "OC",
        "type": "::",
        "args": []
      }
    ],
    "File": "/var/www/html/apps/cloud_federation_api/lib/Controller/RequestHandlerController.php",
    "Line": 455,
    "message": "incoming request exception",
    "exception": {},
    "CustomMessage": "incoming request exception"
  }
}

[skjnldsv]

/backport 9664124 to stable30

[skjnldsv]

/backport bc0109d to stable29