ci: Use meson setup and remove deprecated option --fs-capture-search

ci: Use meson setup and remove deprecated option --fs-capture-search

meson with options has been deprecated for a while, and it may be fully
phased out soon.

For Coverity, --fs-capture-search was deprecated in 2019.09 and has been
fully removed for almost 2 years[0].

[0] https://documentation.blackduck.com/bundle/coverity-docs-2024.6/page/coverity-analysis/topics/moving_from_filesystem_capture_to_the_coverity_cli.html

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/4059>