Remove all unneeded @dnf5 tags

The `main` branch is only for testing dnf5.
To test `dnf4` we use `dnf-4-stack` branch.

Author: kontura

dnf-behave-tests/dnf/aliases.feature

@@ -1,6 +1,5 @@
 # aliases configuration directories are always taken from the host
 @destructive
-@dnf5
 Feature: Test for dnf5 aliases functionality
 
 Background:

dnf-behave-tests/dnf/api/package-query.feature

@@ -1,4 +1,3 @@
-@dnf5
 @not.with_dnf=4
 Feature: api: query packages
 

dnf-behave-tests/dnf/api/package.feature

@@ -1,4 +1,3 @@
-@dnf5
 Feature: api: package
 
 

dnf-behave-tests/dnf/api/repo-query.feature

@@ -1,4 +1,3 @@
-@dnf5
 Feature: api: query repos
 
 

dnf-behave-tests/dnf/api/transaction-remove-install.feature

@@ -1,4 +1,3 @@
-@dnf5
 @not.with_dnf=4
 Feature: transaction: remove a package with dependency, then install the dependency again
 

dnf-behave-tests/dnf/api/transaction-simple-install.feature

@@ -1,4 +1,3 @@
-@dnf5
 @not.with_dnf=4
 Feature: transaction: install a package without dependencies
 

dnf-behave-tests/dnf/api/transaction-test.feature

@@ -1,4 +1,3 @@
-@dnf5
 Feature: transaction: dry-run a transaction
 
 

dnf-behave-tests/dnf/api/transaction-upgrade-downgrade.feature

@@ -1,4 +1,3 @@
-@dnf5
 Feature: transaction: upgrades and downgrades
 
 Background: Install RPMs

dnf-behave-tests/dnf/append_options.feature

@@ -1,4 +1,3 @@
-@dnf5
 Feature: DNF test of append option
 
 # The excludepks append option was choosen for testing.

dnf-behave-tests/dnf/autoremove.feature

@@ -1,6 +1,5 @@
 Feature: Autoremoval of unneeded packages
 
-@dnf5
 Scenario: Autoremoval of package which became non-required by others
   Given I use repository "dnf-ci-fedora"
     And I use repository "dnf-ci-thirdparty"