Calamari Don't delete unextracted package files as part of lifecycle retention

Background

Since #team-fire-and-motion are adding package retention to workers we shouldn't need this functionality when the lifecycle retention policy gets applied as it will be moved to package retention. However, we do still want to clean up the ExtractedTo directory where appropriate. This PR removes the functionality which removes package files stored on a tentacle/worker (ie. the package files now remain on the machine).

How to review

Start Octopus server
Create a Tentacle using the latest main branch from OctopusTentacle (or any version really)
Set up an external package feed Library -> External Feeds. I use https://www.nuget.org/api/v2.
Add a "Deploy a package" step, for the package specify anything with multiple versions. I used Newtonsoft.Json.
Set the retention policy of the default lifecycle to keep 1 release.
Create a release - for this release pick an older version of the package eg. 12.0.1. Deploy the release.
Create another release - for this release pick the next version up eg. 12.0.2. Deploy the release.
Create another release - for this release pick the next version up eg. 12.0.3. Deploy the release. This release should contain a log that looks like the following: Note this is using an old version of Calamari. As you can see it removes both the ExtractedTo at C:\Octopus\Applications\<tentaclename>\Development\Newtonsoft.Json\12.0.1 and the DeployedFrom at C:\Octopus\<tentaclename>\Files\[email protected]....
Pull this branch and build Calamari
Run Calamari in your IDE with the following arguments and environment variables:

TentacleJournal=C:\Octopus\<tentaclename>\DeploymentJournal.xml
TentacleName=C:\Octopus\<tentaclename>
clean --retentionPolicySet "Environments-1/Projects-1/Step-Deploy a Package/Machines-61/<default>" --releases 1

You can find the retentionPolicySet in DeploymentJournal.xml at the home directory of your machine. It should look something like Environments-1/Projects-1/Step-Deploy a Package/Machines-1/<default>. 11. The log should only say that it removed the ExtractedTo contents with no mention of the DeployedFrom. Check the Files directory of your tentacle and [email protected] should still be there.

The tests have been changed as well to account for the fact that packages aren't being deleted anymore. I think this makes sense for RetentionPolicyFixture since removing packages won't be its responsibility anymore. Not as sure about CleanFixture though but the same logic applies - it won't be dealing with packages anymore.