fix(macos): fix "no account for team" and missing provisioning profile

[tido64]

Description

macOS test app fails to build after #553:

• No account for team "UBF8T346G9". Add a new account in the Accounts preference pane or verify that your accounts have valid credentials.
• No profiles for 'com.microsoft.ReactTestApp' were found: Xcode couldn't find any Mac App Development provisioning profiles matching 'com.microsoft.ReactTestApp'.

Reverts the code signing changes made to the macOS Xcode project, and adds the ability to configure code signing from the app manifest.

Platforms affected

• Android
• iOS
• macOS
• Windows

Test plan

1. macOS test app should build again.
2. Signing should work if configured correctly, e.g.

   diff --git a/example/app.json b/example/app.json
   index 8463354..557e1f1 100644
   --- a/example/app.json
   +++ b/example/app.json
   @@ -12,6 +12,12 @@
          "presentationStyle": "modal"
        }
      ],
   +  "macos": {
   +    "bundleIdentifier": "com.contoso.ReactTestApp",
   +    "codeSignEntitlements": "macos/Example.entitlements",
   +    "codeSignIdentity": "Apple Development",
   +    "developmentTeam": "UBF8T346G9"
   +  },
      "resources": {
        "android": [
          "dist/res",

[github-actions]

🎉 This PR is included in version 0.9.7 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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