Drop "repo-pkgs install @Group" support.
Drop group filtering by repository name from installPkgs.

This partially reverts commit 4e236b36744866add4310a198a59a78a19b66200.
Revert "Support filtering by repository name in Base.select_group."

This reverts commit d125a43dc726174f1fff0902abb50aeac4ecaf78.
Revert "Support filtering by repository name in install_groupie."

This reverts commit 02d2e38c01c1df1e4976f400d24798f2d036d907.
refactor: Move repo-pkgs install to a standalone class instead of reusing the InstallCommand.
refactor: Remove the reference to installPkgs from InstallCommand.
refactor: Remove the reference to installPkgs from InstallSubCommand.
remove: BaseCli.installPkgs
refactor: Move repo-pkgs upgrade to a standalone class instead of reusing the UpgradeCommand.
refactor: Remove the reference to updatePkgs from UpgradeCommand.
refactor: Remove the reference to updatePkgs from UpgradeSubCommand.
remove: BaseCli.updatePkgs
refactor: Move repo-pkgs upgrade-to to a standalone class instead of reusing the UpgradeToCommand.