Fix deploy with multiple target/site in firebase.json

[chalosalvador]

Description

Fixes #8274 when using firebase.json with an array of sites/targets. Like the following:

{
  "hosting": [
    {
      "target": "static",
      "public": "public"
    },
    {
      "target": "prod",
      "source": ".",
      "ignore": [
        "firebase.json",
        "**/.*",
        "**/node_modules/**"
      ],
      "frameworksBackend": {
        "region": "europe-west1"
      }
    },
    {
      "target": "staging",
      "source": ".",
      "ignore": [
        "firebase.json",
        "**/.*",
        "**/node_modules/**"
      ],
      "frameworksBackend": {
        "region": "europe-west1"
      }
    }
  ]
}

Scenarios Tested

• firebase.js deploy

• firebase.js deploy --only hosting

• firebase.js deploy --only hosting:static

• firebase.js deploy --only hosting:prod

• firebase.js deploy --only hosting:staging

• firebase.js deploy --only hosting:prod,hosting:static

• Also tested using site in firebase.json instead of target.

Sample Commands