stored: enable labeling of tapes in devices even when autoselect = no

[alaaeddineelamri]

Description

(Backports PR #1021 without its tests, as they did not exist in 20)
When devices are set with the option autoselect=no, labeling and releasing is not possible as the device is skipped in the search. This PR handles this issue by not accounting for the autoselect attribute when searching devices. This has the same effect on the mount, unmount, as well as readlabel and autochanger commands. Backups are not affected.

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