Plugins: Update custom view counts when deleting a plugin.

[andreas-pa]

Trac ticket: https://core.trac.wordpress.org/ticket/65191

Decrements counts for groups registered via the plugins_list filter when a plugin is deleted via AJAX, so tabs whose label is supplied through plugins_list_status_text (introduced in #60495) stay in sync without requiring a page reload. The four hardcoded buckets (upgrade, inactive, active, recently_activated) plus auto-update-enabled / auto-update-disabled keep their explicit fast paths; the new loop only runs for keys outside that set.

Reproduction

See the steps in Trac #65191. TL;DR: register a group via plugins_list with a label supplied through plugins_list_status_text, delete a plugin in that group via the row action, and observe the count badge stay stale until reload.

Test plan

• Hardcoded tabs (Active, Inactive, Update available) still decrement on delete.
• Custom group registered via plugins_list: count drops on delete; tab disappears at zero.
• Sites with no custom groups: no behavior change.

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[github-actions]

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[github-actions]

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