Bug fixes

bug fixed:
Remove unused namespaces, and whitespace fixes

bug fixed:

For list base field, views filter does not works, you may get a fatal error.

Updates make files to be more in line with best practices, which will hopefully prevented the nested profile issue.

Fixes to mouse and position dependency

Issue #3068705 by Stefdewa, WillenLeal: No styling for administration search tray
Issue #3075804 by martijn.cuppens: No fallback for Open Sans font
Issue #3055812 by davisben: Styling for Workspaces toolbar tab
Issue #3042639 by ChaseOnTheWeb: Drupal 9 Deprecated Code Report
Issue #3054893 by dewalt, Tuuuukka, nikolas.tatianenko: Borders flickering on page load
Issue #3082906 by dewalt, pucowanje: Not respecting colors of environment indicator

• Adding case checking and default fallbacks for langcode.
• Adding a minor fix to the drush unregister command.
• Fix ConnectionManager Service to do a complete handling of webhook registration.
• Test successive client cdf generation.
• Status report dashboard and details tests coverage.
• Prevent exporting imported entities on sites that are both publishers and subscribers.
• Added webhook handler for status report and exceptions to prevent syndication when there are pending database updates.