I tested this with a local package build and local repo in a mantic container,
doing an `apt --dry-run dist-upgrade` without/with that repo (w/ noble apt sources list),
and manually download/run noble's release upgrader without/with that repo.

The behavior is the same (ie, no regressions) as expected;
libglib2.0-0 is removed in favor of libglib2.0-0t64 in all cases.

Test 1)

Just Noble:

	$ apt-cache show libglib2.0-bin | grep Version:
	Version: 2.80.0-6ubuntu1
	Version: 2.78.0-2

	$ sudo apt --dry-run dist-upgrade 2>&1 | awk '{ print NR ": " $0 }' | fgrep libglib2.0
	17:   libevent-core-2.1-7 libext2fs2 libgdbm-compat4 libgdbm6 libglib2.0-0
	30:   libgdbm6t64 libglib2.0-0t64 libgnutls30t64 libgpgme11t64
	79:   libglib2.0-bin libglib2.0-data libgmp10 libgomp1 libgpg-error-l10n
	154: Remv libelf1 [0.189-4] [libglib2.0-bin:amd64 libbpf1:amd64 iproute2:amd64 ]
	156: Inst libglib2.0-bin [2.78.0-2] (2.80.0-6ubuntu1 Ubuntu:24.04/noble [amd64]) []
	378: Remv libglib2.0-0 [2.78.0-2] [libappstream4:amd64 open-vm-tools:amd64 libc-dev-bin:amd64 libc-bin:amd64 libc6-dev:amd64 libnetplan0:amd64 ]
	379: Inst libglib2.0-0t64 (2.80.0-6ubuntu1 Ubuntu:24.04/noble [amd64]) [open-vm-tools:amd64 libc-dev-bin:amd64 libc-bin:amd64 libc6-dev:amd64 ]
	611: Inst libglib2.0-data [2.78.0-2] (2.80.0-6ubuntu1 Ubuntu:24.04/noble [all])
	927: Conf libglib2.0-bin (2.80.0-6ubuntu1 Ubuntu:24.04/noble [amd64])
	1070: Conf libglib2.0-0t64 (2.80.0-6ubuntu1 Ubuntu:24.04/noble [amd64])
	1201: Conf libglib2.0-data (2.80.0-6ubuntu1 Ubuntu:24.04/noble [all])

Noble and local build/repo:

	$ apt-cache show libglib2.0-bin | grep Version:
	Version: 2.80.0-6ubuntu3
	Version: 2.80.0-6ubuntu1
	Version: 2.78.0-2

	$ sudo apt --dry-run dist-upgrade 2>&1 | awk '{ print NR ": " $0 }' | fgrep libglib2.0
	17:   libevent-core-2.1-7 libext2fs2 libgdbm-compat4 libgdbm6 libglib2.0-0
	30:   libgdbm6t64 libglib2.0-0t64 libgnutls30t64 libgpgme11t64
	79:   libglib2.0-bin libglib2.0-data libgmp10 libgomp1 libgpg-error-l10n
	154: Remv libelf1 [0.189-4] [libglib2.0-bin:amd64 libbpf1:amd64 iproute2:amd64 ]
	156: Inst libglib2.0-bin [2.78.0-2] (2.80.0-6ubuntu3 localhost [amd64]) []
	378: Remv libglib2.0-0 [2.78.0-2] [libappstream4:amd64 open-vm-tools:amd64 libc-dev-bin:amd64 libc-bin:amd64 libc6-dev:amd64 libnetplan0:amd64 ]
	379: Inst libglib2.0-0t64 (2.80.0-6ubuntu3 localhost [amd64]) [open-vm-tools:amd64 libc-dev-bin:amd64 libc-bin:amd64 libc6-dev:amd64 ]
	611: Inst libglib2.0-data [2.78.0-2] (2.80.0-6ubuntu3 localhost [all])
	927: Conf libglib2.0-bin (2.80.0-6ubuntu3 localhost [amd64])
	1070: Conf libglib2.0-0t64 (2.80.0-6ubuntu3 localhost [amd64])
	1201: Conf libglib2.0-data (2.80.0-6ubuntu3 localhost [all])


Test 2)

Just Noble:

	$ dpkg -l | fgrep libglib2.0
	rc  libglib2.0-0:amd64              2.78.0-2                                amd64        GLib library of C routines
	ii  libglib2.0-0t64:amd64           2.80.0-6ubuntu1                         amd64        GLib library of C routines
	ii  libglib2.0-bin                  2.80.0-6ubuntu1                         amd64        Programs for the GLib library
	ii  libglib2.0-data                 2.80.0-6ubuntu1                         all          Common files for GLib library

	$ dpkg -l | grep thunderbird
	ii  thunderbird                     2:1snap1-0ubuntu3                       amd64        Transitional package - thunderbird -> thunderbird snap

	$ snap list thunderbird
	Name         Version     Rev  Tracking       Publisher   Notes
	thunderbird  115.10.1-1  470  latest/stable  canonical✓  -

Noble and local build/repo:

	$ dpkg -l | fgrep libglib2.0
	rc  libglib2.0-0:amd64              2.78.0-2                                amd64        GLib library of C routines
	ii  libglib2.0-0t64:amd64           2.80.0-6ubuntu3                         amd64        GLib library of C routines
	ii  libglib2.0-bin                  2.80.0-6ubuntu3                         amd64        Programs for the GLib library
	ii  libglib2.0-data                 2.80.0-6ubuntu3                         all          Common files for GLib library

	$ dpkg -l | grep thunderbird
	ii  thunderbird                     2:1snap1-0ubuntu3                       amd64        Transitional package - thunderbird -> thunderbird snap

	$ snap list thunderbird
	Name         Version     Rev  Tracking       Publisher   Notes
	thunderbird  115.10.1-1  470  latest/stable  canonical✓  -