Backport of "gst-inspect: fix --exists for plugins with versions other than GStreamer's version, like the Rust plugins" into 1.22
Backport of !6191 (merged) "gst-inspect: fix --exists for plugins with versions other than GStreamer's version, like the Rust plugins".
Commits:
- fde24952 gst-inspect: fix --atleast-version to be implicitly applied to --exists