"Check performance" action fails on PRs from repository forks

[rg936672]

What's the issue?

See e.g. 45fe9f6, where the action failed as it was from https://github.com/rg936672/coreax rather than https://github.com/gchq/coreax.

The error message is:

RequestError [HttpError]: Resource not accessible by integration
    at /home/runner/work/_actions/actions/github-script/v7/dist/index.js:9537:21
Error: Unhandled error: HttpError: Resource not accessible by integration
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5) {
  status: 403,
  response: {
    url: 'https://api.github.com/repos/gchq/coreax/issues/858/comments',
    status: 403,
    headers: {
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      'content-encoding': 'gzip',
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      date: 'Tue, 12 Nov 2024 14:31:28 GMT',
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      server: 'github.com',
      'strict-transport-security': 'max-age=31536000; includeSubdomains; preload',
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      vary: 'Accept-Encoding, Accept, X-Requested-With',
      'x-accepted-github-permissions': 'issues=write; pull_requests=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': '2C00:86ED8:F[29](https://github.com/gchq/coreax/actions/runs/11799285847/job/32867428578#step:13:30)E04:1DB82A8:673366BF',
      'x-ratelimit-limit': '5000',
      'x-ratelimit-remaining': '4999',
      'x-ratelimit-reset': '1731425488',
      'x-ratelimit-resource': 'core',
      'x-ratelimit-used': '1',
      'x-xss-protection': '0'
    },
    data: {
      message: 'Resource not accessible by integration',
      documentation_url: 'https://docs.github.com/rest/issues/comments#create-an-issue-comment',
      status: '403'
    }
  },
  request: {
    method: 'POST',
    url: 'https://api.github.com/repos/gchq/coreax/issues/858/comments',
    headers: {
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      'user-agent': 'actions/github-script octokit-core.js/5.0.1 Node.js/20.13.1 (linux; x64)',
      authorization: 'token [REDACTED]',
      'content-type': 'application/json; charset=utf-8'
    },
    body: '{"body":"## Performance review\\n###### Commit `1[30](https://github.com/gchq/coreax/actions/runs/11799285847/job/32867428578#step:13:31)e799` - _Merge 45fe9f66e85eeedd401995b5575c0584d26cacca into 3a951bbaae1a8c2d7fef811c84baf36454fe03f8_\\nNo significant changes to performance.\\n"}',
    request: {
      agent: [Agent],
      fetch: [Function: proxyFetch],
      hook: [Function: bound bound register]
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  }
}