This reduces the amount of translations needed to fully translate the
security report summaries and also makes some untranslatable cases
translatable.

Changes include:

-   A common translation format for each report and the grouped report
    by moving the duplicated logic from `textBuilder` and
    `groupedSummaryText` to a combined `groupedTextBuilder`
-   Make it possible to translate the loading and error state of the
    grouped Security Scanning report
-   Unify the translations for loading and error states of the
    individual security reports
-   Adjusted the language from `TYPE resulted in error while loading
    results` to `TYPE: Loading resulted in an error` for errors during
    the report retrieval
-   Summaries in the merge request widget that said `TYPE detected X new
    vulnerabilities and Y fixed vulnerabilities` now say `TYPE detected
    X new, and Y fixed vulnerabilities`