Fix: Misleading error message on user screen actions, if no role has been selected

[hbhalodia]

Trac ticket: https://core.trac.wordpress.org/ticket/65160

Description

• Update the message on users.php list when a role change action is performed without selecting any role, which says Please select a bulk action to perform., instead added Please select a role to change. so that users does not mislead the information.

Use of AI Tools

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