Auto-importing completions query unrelated bodies

[Veykril]

In auto importing completions we use the crate_symbols query which runs module_symbols queries which then query for bodies of body definitions for collecting items defined inside of them. This is done for world symbols lookup, but these inner items are irrelevant to auto importing completions as there is no path that can be used to refer to them (except for inner items declared inside of the body we are completing in).

We should separate this somehow.

[Veykril]

We apparently unconditionally parse files in module_symbols already for fetching the name ranges. That's also something we should try to avoid. Fixed in #14715