Add support for wildcard import files in manifest.json

[ajaits]

Tested with a test import manually with the json:

{
  "import_specifications": [
    {
      "import_name": "TestImport",
      "scripts": ["run.sh"],
      "import_inputs": [
        {
          "template_mcf": "india_census_sample_output.tmcf",
          "cleaned_csv": "india_census_sample_output.csv"
        },
        {
          "template_mcf": "sample_output.tmcf",
          "cleaned_csv": "sample*output.csv"
        }
      ],
      "cron_schedule": "15 22 10 1,7 *"
    }
  ]
}

Files were copied to: https://pantheon.corp.google.com/storage/browser/unresolved_mcf/scripts/test_import/TestImport/2025_01_23T09_14_53_686180_08_00