fix: validate credentials when setting aliases #510

Job	Run time
Build (ubuntu-latest)	3m 22s
Clippy	35s
Test (macos-latest)	1m 0s
Test (ubuntu-latest)	59s
Minimum Supported Rust Version	39s
Build (windows-latest)	6m 38s
Format Check	13s
Build (macos-latest)	4m 32s
Protected Files Check	6s
Documentation	26s
Test (windows-latest)	2m 15s
	20m 45s

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