Add UDFs for Tails 4.0~beta1.

wiki/src/upgrade/v1/Tails/4.0~beta1/amd64/alpha/upgrades.yml

+---
+build-target: amd64
+channel: alpha
+product-name: Tails
+product-version: '4.0~alpha1'

wiki/src/upgrade/v1/Tails/4.0~beta1/amd64/alpha/upgrades.yml.pgp

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wiki/src/upgrade/v1/Tails/4.0~beta1/amd64/stable/upgrades.yml

+---
+build-target: amd64
+channel: stable
+product-name: Tails
+product-version: '4.0~alpha1'

wiki/src/upgrade/v1/Tails/4.0~beta1/amd64/stable/upgrades.yml.pgp

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