omni-node: Tolerate failing metadata check

[skunert]

#6450 introduced metadata checks. Supported are metadata v14 and higher.

However, of course old chain-specs have a genesis code blob that might be on older version. This needs to be tolerated. We should just skip the checks in that case.

Fixes #6921

[skunert]

/cmd prdoc --bump patch --audience node_operator

[bkchr]

Just activate the legacy feature of frame-metadata to have decoding work for all metadata's?

[bkchr]

As discussed in DM, let's merge this and see if we can prevent this from happening in the future.

[paritytech-cmd-bot-polkadot-sdk]

Created backport PR for stable2407:

• [stable2407] Backport #6923 #6932 with remaining conflicts!

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

git fetch origin backport-6923-to-stable2407
git worktree add --checkout .worktree/backport-6923-to-stable2407 backport-6923-to-stable2407
cd .worktree/backport-6923-to-stable2407
git reset --hard HEAD^
git cherry-pick -x e6ddd3925693adbf538a438c94dc66e66eba9bed
git push --force-with-lease

[paritytech-cmd-bot-polkadot-sdk]

Created backport PR for stable2409:

• [stable2409] Backport #6923 #6933 with remaining conflicts!

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

git fetch origin backport-6923-to-stable2409
git worktree add --checkout .worktree/backport-6923-to-stable2409 backport-6923-to-stable2409
cd .worktree/backport-6923-to-stable2409
git reset --hard HEAD^
git cherry-pick -x e6ddd3925693adbf538a438c94dc66e66eba9bed
git push --force-with-lease

[paritytech-cmd-bot-polkadot-sdk]

Created backport PR for stable2412:

• [stable2412] Backport #6923 #6934 with remaining conflicts!

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

git fetch origin backport-6923-to-stable2412
git worktree add --checkout .worktree/backport-6923-to-stable2412 backport-6923-to-stable2412
cd .worktree/backport-6923-to-stable2412
git reset --hard HEAD^
git cherry-pick -x e6ddd3925693adbf538a438c94dc66e66eba9bed
git push --force-with-lease