[wp-trac] [WordPress Trac] #59525: Add filter for `get_mu_plugins()`

[WordPress Trac]

#59525: Add filter for `get_mu_plugins()`
-------------------------+-----------------------------
 Reporter:  rebasaurus   |      Owner:  (none)
     Type:  enhancement  |     Status:  new
 Priority:  normal       |  Milestone:  Awaiting Review
Component:  General      |    Version:
 Severity:  normal       |   Keywords:
  Focuses:               |
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 In https://core.trac.wordpress.org/ticket/57278, there was a need to be
 able to filter MU-plugins on the UI. However, for WP-CLI, when we call `wp
 plugin list` for MU-plugins, it calls `get_mu_plugins()`. It'd be nice if
 it was filterable to match the changes on the UI end.

 It does look like WP-CLI does have the filter `all_plugins` for the drop-
 in plugins at https://github.com/wp-cli/extension-
 command/blob/17b16548b5775616dcbbd92f7836e67bba02e8ba/src/WP_CLI/Fetchers/Plugin.php#L23
 to match Core's at
 https://github.com/WordPress/WordPress/blob/2a2cbb3b497fa1b95f15b0d11a47a761fa2ccc21
 /wp-admin/includes/class-wp-plugins-list-table.php#L104, but that appears
 to only apply for the drop-ins.

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Ticket URL: <https://core.trac.wordpress.org/ticket/59525>
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