Support allow_free_text in extended metadata controlled vocab attributes

[Copilot]

Extended metadata type attributes needed to accept both controlled vocabulary suggestions and free text via an allow_free_text flag in the EMT JSON schema.

• Schema: Added allow_free_text to EMT attribute schema (both basic and CV/linked variants) so JSON uploads can declare free-text allowance.
• Import: Persisted allow_free_text into allow_cv_free_text when creating extended metadata attributes from JSON.
• Serialization: Exposed allow_free_text in the extended metadata type serializer for API consumers.
• Tests/fixtures: Updated CV EMT fixture and extractor test to cover allow_free_text behavior.

Example:

{
  "attributes": [
    {
      "title": "Topics",
      "type": "Controlled Vocabulary",
      "ID": "CV_TOPICS_ID",
      "allow_free_text": true
    }
  ]
}

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• esm.ubuntu.com
  • Triggering command: /usr/lib/apt/methods/https /usr/lib/apt/methods/https -I . -I ./libsass/include --gdwarf-5 --64 -o utf8_string.o /tmp/ccrlT5ol.s -I -g++ comp�� ITS=64 RCE cal/share/gem/ru-I or/bundle/ruby/3echo -I GES as (dns block)
• oss-binaries.phusionpassenger.com
  • Triggering command: /usr/bin/curl curl -f -L -o rubyext-ruby-3.2.3-x86_64-linux.tar.gz.tmp -s -S --connect-timeout 4 --speed-time 5 --speed-limit 1 --max-time 10 REDACTED lient or/bundle/ruby/3-I p or/bundle/ruby/3-I (dns block)
• s3.amazonaws.com
  • Triggering command: /usr/bin/curl curl -f -L -o rubyext-ruby-3.2.3-x86_64-linux.tar.gz.tmp -s -S --connect-timeout 4 --speed-time 5 --speed-limit 1 --max-time 10 REDACTED lient bgit2/deps/pcre p bgit2/deps/xdiff (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

#2449
could you work on this github issue

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