Protected tags API: deploy keys cannot be set for Free tier

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Problem

Reported here: #402238 (comment 2518813222)

Users can choose Deploy Keys to configure Protected Tags via UI.

However, an attempt to set the deploy key via API doesn't set the key.

Click to expand

% curl \
   --request POST \
   --header "PRIVATE-TOKEN: [MASKED]" \
   --header "Content-Type: application/json" \
   --url "https://[MASKED].com/api/v4/projects/3354/protected_tags" \
   --data '{
      "name" : "scm/*",
      "create_access_level" : 40,
      "allowed_to_create" : [
         { "access_level" : 40 },
         { "deploy_key_id" : 1801 }
      ]
   }'

{
   "name": "scm/*",
   "create_access_levels": [
      {
         "id": 718,
         "access_level": 40,
         "access_level_description": "Maintainers",
         "deploy_key_id": null
      }
   ]
}

Proposal

API doesn't support deploy_key setting because this configuration is limited to EE version only.

We should explore an option to allow configuring deploy_key via API for Free tier as well.