fix(add-ons): disable discovery add-on on site and project wide

[nijel]

Proposed changes

It currently shows preview based on the component, so it crashes without it.

While technically there is no reason not to allow it, it is unlikely that a single discovery add-on configuration would work on different repositories.

Fixes #11939 Fixes WEBLATE-QC

Checklist

• [ ] Lint and unit tests pass locally with my changes.
• [ ] I have added tests that prove my fix is effective or that my feature works.
• [ ] I have added documentation to describe my feature.
• [ ] I have squashed my commits into logic units.
• [ ] I have described the changes in the commit messages.

Other information

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 90.62%. Comparing base (6aee586) to head (14fa77d). Report is 2318 commits behind head on main.

Additional details and impacted files

[](https://app.codecov.io/gh/WeblateOrg/weblate/pull/11943?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=WeblateOrg) ```diff @@ Coverage Diff @@ ## main #11943 +/- ## ========================================== - Coverage 90.82% 90.62% -0.21% ========================================== Files 554 581 +27 Lines 57306 58994 +1688 Branches 9122 9413 +291 ========================================== + Hits 52046 53461 +1415 - Misses 3640 3836 +196 - Partials 1620 1697 +77 ``` | [Files](https://app.codecov.io/gh/WeblateOrg/weblate/pull/11943?dropdown=coverage&src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=WeblateOrg) | Coverage Δ | | |---|---|---| | [weblate/addons/base.py](https://app.codecov.io/gh/WeblateOrg/weblate/pull/11943?src=pr&el=tree&filepath=weblate%2Faddons%2Fbase.py&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=WeblateOrg#diff-d2VibGF0ZS9hZGRvbnMvYmFzZS5weQ==) | `87.39% <100.00%> (-1.21%)` | :arrow_down: | | [weblate/addons/discovery.py](https://app.codecov.io/gh/WeblateOrg/weblate/pull/11943?src=pr&el=tree&filepath=weblate%2Faddons%2Fdiscovery.py&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=WeblateOrg#diff-d2VibGF0ZS9hZGRvbnMvZGlzY292ZXJ5LnB5) | `90.62% <100.00%> (ø)` | | | [weblate/api/serializers.py](https://app.codecov.io/gh/WeblateOrg/weblate/pull/11943?src=pr&el=tree&filepath=weblate%2Fapi%2Fserializers.py&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=WeblateOrg#diff-d2VibGF0ZS9hcGkvc2VyaWFsaXplcnMucHk=) | `92.26% <0.00%> (-0.20%)` | :arrow_down: | ... and [339 files with indirect coverage changes](https://app.codecov.io/gh/WeblateOrg/weblate/pull/11943/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=WeblateOrg)