With the introduction of temporary backups of plugins and themes before updating, a new Site Health test was added to verify that plugin and theme temporary backup directories are writable or can be created.
When using a non-direct filesystem, the Site Health test did not include the required credentials, leading to a fatal error as the connection was not initialized properly.
This commit attemps to use the stored credentials if available, and displays a message otherwise.
Includes a similar fix in a function that performs a cleanup of the temporary backup directory.
Follow-up to [55720].
Props utsav72640, rajinsharwar, costdev, mukesh27, peterwilsoncc, audrasjb, SergeyBiryukov.
See #58940.
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