repoman is deprecated and masked for removal. It is no longer used nor
required by the fem-overlay CI pipeline.

The new feature for which the live ebuild was used, is present in 0.2.1,
which is already keyworded for amd64.

Might reduce the image size slightly.

To utilize the new --ignore-fetch-restricted feature which isn't part of
a release yet.

It is completely unnecessary to sync the fem-overlay in this image,
since it's being removed afterwards, anyways. This commit thus removes
anything responsible in the fem-overlay beings synced as well as the now
obsolete cleanup actions.