sdk: Enable tracker3 search backend in GTK
Previously submitted as !826 (merged) which caused a series of build failures.
To fix these issues we made libtracker-data.so into a static library: tracker!307 (merged)
Additionally we added a check in GTK to fallback to tracker2 search backend if we detect that the process is linked against libtracker-sparql-2.0: gtk!2513 (merged)
Branch submitted with -o ci.variable=BST_STRICT=--strict