feat(search): tagFilters

[abulte]

Close ecolabdata/ecospheres#1011

Adds a tagFilters option to GlobalSearchConfig that renders select dropdowns whose values map to the tag API param.

This enables multiple independent predefined-value tag filters (e.g. theme, enjeu, secteur like on https://ecologie.data.gouv.fr/indicators) that merge correctly with hiddenFilters and the native tag filter.

The URL is two-way synced with the dropdowns. Query param name is filter's name.

Example usage:

const config: GlobalSearchConfig = [
    {
        class: 'datasets',
        hiddenFilters: [
            { key: 'tag', value: 'ecospheres-indicateurs' },
            { key: 'organization', value: '67884b4da4fca9c97bbef479' }
        ],
        basicFilters: ['last_update_range', 'badge'],
        advancedFilters: [],
        tagFilters: [
            {
                urlParam: 'theme',
                label: 'Thématique',
                defaultLabel: 'Toutes les thématiques',
                values: [
                    { value: 'ecospheres-indicateurs-theme-mieux-consommer', label: 'Mieux consommer' },
                    { value: 'ecospheres-indicateurs-theme-mieux-produire', label: 'Mieux produire' },
                    // ...
                ]
            },
            {
                urlParam: 'enjeu',
                label: 'Enjeu',
                defaultLabel: 'Tous les enjeux',
                values: [
                    { value: 'ecospheres-indicateurs-enjeu-adaptation-climat', label: 'Adaptation climat' },
                // ...
                ]
            },
            // secteur, levier, maille…
        ]
    }
]

Selecting "Mieux consommer" in Thème dropdown → theme=ecospheres-indicateurs-theme-mieux-consommer in the URL → API receives tag=ecospheres-indicateurs&tag=ecospheres-indicateurs-theme-mieux-consommer.

Bonus

• export some types needed for feat: unified search opendatateam/udata-front-kit#1153.
• export .input style that need to be used by consuming projects

[abulte]

CI output, failures seem unrelated? https://github.com/ecolabdata/cdata/actions/runs/24194727780

[abulte]

@maudetes @ThibaudDauce @nicolaskempf57 don't know why it's not assigning you as reviewers 🤷 And I can't do it myself, hence the ping. Thanks!