fix: defend against bad mdapi responses

[mshanemc]

What does this PR do?

handles undefined being passsed to a method that expects strings. It'd be better if all the consumers of this warned which component was missing its filename in the MDAPI reponse, but this at least prevents the unhelpful error.

How'd this get by us? The mdapi response isn't matching its expected typing. I'm guessing that's a server bug related to the new release, but am waiting for the full deployResult so I can inspect its contents. One of the DeployMessage is unexpectedly missing the fileName property.

ex: forcedotcom/cli#2697
also got a report of this happening on push

  "code": 10.0,
  "context": "Push",
  "commandName": "Push",
  "message": "Cannot read properties of undefined (reading \u0027split\u0027)",
  "name": "TypeError",
  "status": 10.0,
  "stack": "TypeError: Cannot read properties of undefined (reading \u0027split\u0027)\n    at sf\\client\\2.27.6-2617cbc\\node_modules\\@salesforce\\source-deploy-retrieve\\lib\\src\\resolve\\treeContainers.js:183:37\n    at Array.map (\u003canonymous\u003e)\n    at VirtualTreeContainer.fromFilePaths (sf\\client\\2.27.6-2617cbc\\node_modules\\@salesforce\\source-deploy-retrieve\\lib\\src\\resolve\\treeContainers.js:182:15)\n    at PushResultFormatter.componentsFromFilenames (/sf/client/2.27.6-2617cbc/node_modules/@salesforce/plugin-source/lib/formatters/source/pushResultFormatter.js:207:79)\n    at PushResultFormatter.correctFileResponses (/sf/client/2.27.6-2617cbc/node_modules/@salesforce/plugin-source/lib/formatters/source/pushResultFormatter.js:102:57)\n    at new PushResultFormatter (/sf/client/2.27.6-2617cbc/node_modules/@salesforce/plugin-source/lib/formatters/source/pushResultFormatter.js:27:35)\n    at Push.formatResult (/sf/client/2.27.6-2617cbc/node_modules/@salesforce/plugin-source/lib/commands/force/source/push.js:199:27)\n    at Push.run (/sf/client/2.27.6-2617cbc/node_modules/@salesforce/plugin-source/lib/commands/force/source/push.js:67:21)\n    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)\n    at async Push._run (sf\\client\\2.27.6-2617cbc\\node_modules\\@oclif\\core\\lib\\command.js:304:22)",
  "exitCode": 10.0,
  "warnings": [
    "We plan to deprecate this command in the future. Try using the \"project deploy start\" command instead.",
    "The \"-u\" flag has been deprecated. Use \"--target-org | -o\" instead.",
    "Network error occurred.  Continuing to poll."
  ]
}

What issues does this PR fix or reference?

#, @@

Functionality Before

<insert gif and/or summary>

Functionality After

<insert gif and/or summary>