As a user, I want to be able to select a channel and version of an operator to install from the Extension Catalog details panel. When I select a channel and version, then click install, this should determine the bundle which will be installed when I click the "Install" button.

AC:

• "Channel" selector is added to the Extension Catalog details pane and list all channels available for the currently selected package
• "Version" selector is added to the Extension Catalog details pane and lists all versions available for the currently selected channel
• the currently selected packages "default channel" should be selected by default when the operator details panel first opens
• selections do not need to be retained when closing and re-opening the details pane
• Version items in the version selector should be sorted in semver order, with the latest version at the top
• Changing the selected channel should update the version selector to the latest version available in the newly selected channel
• Clicking "Install" should lead to a ClusterExtension creation page, with the selected channel and version pre-filled in the spec
• e2e tests are added to assert the above behaviors

Non-goals:

• the description and other metadata do not need to change based on selected channel and version