Remove strict fork checks

[nflaig]

there is another similar check for fulu which will blow up once we reach the next hard fork

lodestar/packages/beacon-node/src/chain/seenCache/seenGossipBlockInput.ts

Lines 193 to 194 in 67ae8e2

	if (blockCache.cachedData?.fork !== ForkName.fulu) {
	throw Error(`data column data at non fulu fork=${blockCache.fork}`);

need to make sure we revisit all the strict fork checks and use fork guards (eg. isForkPostFulu) in such cases instead

Originally posted by @nflaig in #8004 (comment)

[nflaig]

maybe resolved by #8125 but need to review this once more when merge to unstable and enable new codepaths of block input refactor

=== ForkName.fulu and !== ForkName.fulu should both have 0 search results

[philknows]

We should double check this after blockinput refactor. Particularly in ByRange, ByRoot and UnknownBlock.

[nflaig]

=== ForkName.fulu and !== ForkName.fulu should both have 0 search results

resolved since we merged #8200