feat: add update conditions to index.json

[brandonskiser]

Description of changes:

• Changing support for disable_autoupdate in the index.json to instead updateConditions, where we specify special conditions that are applied when clients are updating into a specific version.

This enables us to mark versions that require some conditions to be met before being updated into.

Currently, we only require preventing certain product names from auto-updating into a version with another product name.

With an example:

"versions": [
    {
      // Only allow clients with the product name "Amazon Q" can update into "1.2.1"
      "version": "1.2.1",
      "updateConditions": [
          {
              "allowedAutoUpdateProductNames": ["Amazon Q"]
          }
      ],
      "packages": [ .. ]
   },
   {
      // All clients can update into 1.2.2
      "version": "1.2.2",
      "packages": [ .. ]
   },
   {
      // NO clients can update into "1.2.3"
      "version": "1.2.3",
      "updateConditions": [
          {
              "allowedAutoUpdateProductNames": [""]
          }
      ],
      "packages": [ .. ]
   },
]

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