Error when creating a ruleset isn't propagated to UI

[ahpook]

Describe the bug

I created a private mirror on a test instance, and setting the branch protection ruleset failed because only GitHub Pro organizations can have rulesets on private repositories. But the error wasn't surfaced anywhere in the UI and I had to dig thru logs to find out what happened.

To Reproduce

1. Set up a PMA instance on a free organization
2. Create a private mirror
3. Go to the mirror's settings and note there are no branch protections active
4. Check out the http log messages and search for a request to `https://api.github.com/repos/ORG-NAME/MIRROR-REPO-NAME/branches/main/protection, note the 403 returned (pasted below)

Expected behavior

There should be an informational message on the UI that indicates a problem occured while creating the mirror

Screenshots

No response

Additional context

{
  "meta": {
    "runtime": "Nodejs",
    "runtimeVersion": "v22.5.1",
    "hostname": "7eb1a3d020f1",
    "name": "bot",
    "date": "2024-09-27T05:38:34.488Z",
    "logLevelId": 5,
    "logLevelName": "ERROR",
    "path": {
      "fullFilePath": "/app/.next/server/pages/api/webhooks.js:146:5621",
      "fileName": "webhooks.js",
      "fileNameWithLine": "webhooks.js:146",
      "fileColumn": "5621",
      "fileLine": "146",
      "filePath": "/.nex t/server/pages/api/webhooks.js",
      "filePathWithLine": "/.next/server/pages/api/webhooks.js:146",
      "method": "c"
    }
  },
  "message": "Failed to create branch protection for default branch",
  "data": {
    "error": {
      "name": "HttpError",
      "statu s": 403,
      "response": {
        "url": "https://api.github.com/repos/ORGNAME/PRIVATE-MIRROR-NAME/branches/main/protection",
        "status": 403,
        "headers": {
          "access-control-allow-origin": "*",
          "access-control-expose-headers": "ETag, Link, Location, Retry-After, X-GitHub-OTP, X-RateLimit-Limit, X-RateLimit-Remaining, X-RateLimit-Used, X-RateLimit-Resource, X-RateLimit-Reset, X-OAuth-Scopes, X-Accepted-OAuth-Scopes, X-Poll-Interval, X-GitHub-Media-Type, X-GitHub-SSO, X-GitHub-Request-Id, Deprecation, Sunset",
          "content-encoding": "gzip",
          "content-security-policy": "default-src 'none'",
          "content-type": "application/json; charset=utf-8",
          "date": "Fri, 27 Sep 2024 05:38:34 GMT",
          "referrer-policy": "origin-when-cross-origin, strict-origin-when-cross-origin",
          "server": "github.com",
          "strict-transport-security": "max-age=31536000; includeSubdomains; preload",
          "transfer-encoding": "chunked",
          "vary": "Accept-Encoding, Accept, X-Requested-With",
          "x-accepted-github-permissions": "administration=write",
          "x-content-type-options": "nosniff",
          "x-frame-options": "deny",
          "x-github-api-version-selected": "2022-11-28",
          "x-github-media- type": "github.v3; format=json",
          "x-github-request-id": "2A80:17D99D:F5B9ED:1CF4CBE:66F644D9",
          "x-ratelimit-limit": "5000",
          "x-ratelimit-remaining": "4989",
          "x-ratelimit-reset": "1727419085",
          "x-ratelimit-resource": "core",
          "x-r atelimit-used": "11",
          "x-xss-protection": "0"
        },
        "data": {
          "message": "Upgrade to GitHub Pro or make this repository public to enable this feature.",
          "documentation_url": "https://docs.github.com/rest/branches/branch-protection#update-branch-protection",
          "status": "403"
        }
      },
      "request": {
        "method": "PUT",
        "url": "https://api.github.com/repos/ORGNAME/PRIVATE-MIRROR-NAME/branches/main/protection",
        "headers": {
          "accept": "application/vnd.github.v3+json",
          "user-agent": "probot/13.3.6 octokit-core.js/5.0.2 Node.js/22",
          "x-github-delivery": "ba45f0f0-7c92-11ef-9833-a4f3eed6d2c0",
          "authorization": "token [REDACTED]",
          "content-type": "application/json; charset=utf-8"
        }
      }
    }
  }
}

"body":"{\ "enforce_admins\":true,\"required_pull_request_reviews\":{\"dismiss_stale_reviews\":true,\"require_code_owner_reviews\":false,\"required_approving_review_count\":1,\"dismissal_restrictions\":{\"users\":[],\"teams\":[ ]}},\"required_status_checks\":null,\"restrictions\":null}","request":{}