feat: Add `XDG_CONFIG_HOME`/`.config` to search of pixi global manifest path #5999

Job	Run time
Check intra-doc links	1m 14s
Cargo Machete	1m 1s
Extract crate metadata	12s
Cargo Test \| Linux	5m 11s
Cargo Format	24s
Cargo Lint	2m 2s
Cargo Test \| macOS	5m 15s
Cargo Test \| macOS-arm	5m 11s
Cargo Test \| Windows	4m 54s
Build Binary \| Linux-x86_64	4m 39s
Build Binary \| Linux-aarch64	4m 50s
Build Binary \| macOS-x86	4m 50s
Build Binary \| macOS-arm	4m 51s
Build Binary \| Windows	3m 49s
Build Binary \| Windows-arm	4m 35s
Test examples, downstream projects and integration	1s
Only run example tests if relevant code or manifests have changed	1s
Test installation of common wheels	1s
Export tests	1s
	53m 2s

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