fix(shell): relative command path for tests (#13767)

[zenbal]

Relying on std::env::current_exe()?.parent() to determine the sidecar_path does not work for tests.

fixes tauri-apps/tauri/issues/13767

[github-actions]

Package Changes Through 60f35ed

There are 10 changes which include fs with patch, fs-js with patch, nfc with patch, nfc-js with patch, opener with minor, opener-js with minor, os with patch, os-js with patch, store with minor, store-js with minor

Planned Package Versions

The following package releases are the planned based on the context of changes in this pull request.

package	current	next
api-example	2.0.32	2.0.33
api-example-js	2.0.28	2.0.29
fs	2.4.1	2.4.2
fs-js	2.4.1	2.4.2
dialog	2.3.2	2.3.3
dialog-js	2.3.2	2.3.3
opener	2.4.0	2.5.0
opener-js	2.4.0	2.5.0
http	2.5.1	2.5.2
http-js	2.5.1	2.5.2
nfc	2.3.0	2.3.1
nfc-js	2.3.0	2.3.1
os	2.3.0	2.3.1
os-js	2.3.0	2.3.1
persisted-scope	2.3.1	2.3.2
store	2.3.0	2.4.0
store-js	2.3.0	2.4.0

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