[wp-meta] [Making WordPress.org] #8216: Plugin translation import - remove_filter fails to remove import status

[Making WordPress.org]

#8216: Plugin translation import - remove_filter fails to remove import status
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 Reporter:  timse201                  |      Owner:  (none)
     Type:  defect (bug)              |     Status:  new
 Priority:  normal                    |  Milestone:
Component:  Translate Site & Plugins  |   Keywords:
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 In the Import_Plugin_Translations WP-CLI command, the add_filter and
 remove_filter function for the import status do not match.

 Currently, the filter is added using an array callback, but the code
 attempts to remove it using a string.

 It should not cause immediate issues for a file import.

 The PR also modernizes array key checks using the null coalescing operator

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Ticket URL: <https://meta.trac.wordpress.org/ticket/8216>
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