[Merge] ~enr0n/ubuntu-release-upgrader:t64-replacements into ubuntu-release-upgrader:ubuntu/main

[Nick Rosbrook]

Nick Rosbrook has proposed merging ~enr0n/ubuntu-release-upgrader:t64-replacements into ubuntu-release-upgrader:ubuntu/main.

Requested reviews:
  Julian Andres Klode (juliank)
Related bugs:
  Bug #2058227 in apt-xapian-index (Ubuntu): "Crash during upgrade from Mantic to Noble due to Python 3.12"
  https://bugs.launchpad.net/ubuntu/+source/apt-xapian-index/+bug/2058227
  Bug #2061175 in ubuntu-release-upgrader (Ubuntu): "Handle (t64) package replacements"
  https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/2061175
  Bug #2061181 in ubuntu-release-upgrader (Ubuntu): "upgrade fails with KeyError: "The cache has no package named 'linux-image-raspi'""
  https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/2061181

For more details, see:
https://code.launchpad.net/~enr0n/ubuntu-release-upgrader/+git/ubuntu-release-upgrader/+merge/464340

Add a couple new quirks. One is to handle t64 replacement packages on upgrade. Another is to ignore crashes from update-apt-xapian-index during the upgrade. Finally, fix a mistake in a quirk from a previous upload.
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