Steps to reproduce:
# Open or create a project
# Go to "Window" ->"Package Manager"
# Go to the "My Assets" section
# If you don't have any assets please download them (for example "Food pack - 3D Microgames Add-Ons")
# Click on a "+" on the import button
# Check that all assets would be checked and click "Import"
# Verify, that assets were imported
# Go back to the "Package Manager" and find the same asset package
# Select the "Remove asset from project" option, which is displayed under the "In Project" button
# In the "Remove" window uncheck all the assets and select just "banana" and click the "Remove" button
# Go back to the "Package Manager" and find the "Re-import" option under the "In Project" button
# Check that only the "banana" item is checked in the "Import Unity Package" window
# Check the "All" button, which is displayed as active above all the assets
# Click it and observe what it does.

Expected result: "All" button in this case should be displayed as disabled as there are no other items, which could be selected for the import.

Actual result:  "All" button is displayed as active. Nothing happens if the user clicks on it. A screenshot and video are added in the Attachments section.

Reproducible with: 2023.2.0a23, 2023.1.4f1.

Not reproducible with: 2022.3.4f1, 2021.3.28f1 as "Remove" functionality doesn't exist in these streams.