useblock libraries that dynamically register directives have to be placed in ubc `ignore_directives`

[MrChocolateMoose]

Describe the bug
It is a bit unexpected to have to add explicit code like this in my ubproject.toml once I start using all of the sphinx-addons together (codelinks, test-reports):

[parse]
ignore_directives = [
  "src-trace",
  "test-case",
  etc
]

I know that the needs defined in the toml and those defined by the sphinx add-ons work differently, but these libraries are advertised as what I should use for the use case (testing, source code tracing).

This is a very minor issue for me, and I am already working around it using the above, but I wanted to report it anyways.

To Reproduce

• Set up sphinx-codelinks and/or sphinx-test-reports in your repo.
• Set up ubc to lint on pre-commit or run manually
• It will complain on files using test directives or trace directives

Expected behavior

• Nothing needs to be added and ubc and ubcode have knowledge to ignore or to know more about useblocks addons

Screenshots

UBC documentation linting................................................Failed
- hook id: ubc-check
- duration: 1.31s

UBC license information retrieved successfully
UBC license is valid until XXX
UBC licenses in use: XXX
UBC license is active
Running UBC check on 1 file(s)...
Using config file: /home/XX/XX/ubproject.toml
Processing new files... ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 1/1 0:00:00
[block.directive_unknown]
   --> XX/YY/ZZ/
   Unknown directive: 'test-case'
...

Desktop (please complete the following information):

• OS: ubuntu 22.04LTS
• Architecture x64
• ubCode version: 0.20.1b

Additional context
Add any other context about the problem here.