[stable2506] Backport #9326

[paritytech-release-backport-bot]

Backport #9326 into stable2506 from serban300.

See the documentation on how to use this bot.

[paritytech-release-backport-bot]

Please cherry-pick the changes locally and resolve any conflicts.

git fetch origin backport-9326-to-stable2506
git worktree add --checkout .worktree/backport-9326-to-stable2506 backport-9326-to-stable2506
cd .worktree/backport-9326-to-stable2506
git reset --hard HEAD^
git cherry-pick -x bd78cc52b6271e2463b32de80410ab26602fc616
git push --force-with-lease

[acatangiu]

cc @serban300

[serban300]

We shouldn't backport this to stable2506

stable2506 contains only part of the initial code (just the part related to relaxing the advancement rule on the relay chain)