With a new direction in the 6.5.4 to restore the Activate button's href (see [58250]), the changesets committed for 6.5.3 (see #60992) are now dead code and will not render the admin notice on successful plugin activation.
This commit is a clean revert of r58081.
Follow-up to [58250].
Props swissspidy, azaozz, costdev, jorbin, hellofromTonya, afragen.
Fixes#61331.
See #60992, #61319.
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