Remove 4.4.2 UDFs: it was never released.

While the release process concentrates on that clean-up happening in the
stable and devel branches, it seems doing that in master shouldn't hurt,
as that should ensure those files are not re-introduced after deletion
from the other branches, when merging master → stable → devel.

wiki/src/upgrade/v2/Tails/4.4.2/amd64/alpha/upgrades.yml

----
-build-target: amd64
-channel: alpha
-initial-install-version: 4.4.2
-product-name: Tails

wiki/src/upgrade/v2/Tails/4.4.2/amd64/alpha/upgrades.yml.pgp

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wiki/src/upgrade/v2/Tails/4.4.2/amd64/stable/upgrades.yml

----
-build-target: amd64
-channel: stable
-initial-install-version: 4.4.2
-product-name: Tails

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