api manifests should not contain a kiota hash

[baywet]

When I generate an API manifest I get the following result

{
  "applicationName": "application",
  "apiDependencies": {
    "github": {
      "apiDescriptionUrl": "https://raw.githubusercontent.com/APIs-guru/openapi-directory/gh-pages/v2/specs/github.com/api.github.com/1.1.4/openapi.json",
      "apiDeploymentBaseUrl": "https://api.github.com/",
      "requests": [
        {
          "method": "POST",
          "uriTemplate": "markdown"
        }
      ],
      "extensions": {
        "x-ms-kiota-hash": "75936866893F983D9B8E247A93D0F2DBE4F5B1CE4CC76EB85FEF8AE46B1791F7F130ACCF202043576645EBC8D3E2E6F2E76768F42FCC58945286D775253380C8"
      }
    }
  }
}

notice that it contains an extension with the kiota hash.
This is caused because we need that kiota hash in the kiota manifest for the workspace, which we need/should keep. However it should not be in the plugin manifest.