deprecate /eth2/beacon_chain/req/beacon_blocks_by_{range,root}/1/

[tersec]

For when ethereum/consensus-specs#3014 is merged

This could wait until an actual consensus spec release, but doesn't have to, because as noted:

There haven't been any phase0 blocks in mainnet or any of the still-supported testnets in MIN_EPOCHS_FOR_BLOCK_REQUESTS regardless, so the spec already technically supports not serving said blocks.

So it can be merged as soon as that spec PR is merged.

[etan-status]

Should we still do the rate limiting?

     peer.updateRequestQuota(blockByRangeLookupCost)
     peer.awaitNonNegativeRequestQuota()

[tersec]

Should we still do the rate limiting?

     peer.updateRequestQuota(blockByRangeLookupCost)
     peer.awaitNonNegativeRequestQuota()

Sure, why not: f1960c8

Discourages use of it, since it's not entirely free.

[github-actions]

Unit Test Results

0 files   -          9  0 suites   - 873   0s ⏱️ - 25m 52s
0 tests  -   2 704  0 ✔️  -   2 511  0 💤  - 193  0 ❌ ±0 
0 runs   - 11 783  0 ✔️  - 11 564  0 💤  - 219  0 ❌ ±0 

Results for commit f71d376. ± Comparison against base commit 9572bb8.

♻️ This comment has been updated with latest results.

[tersec]

ethereum/consensus-specs#3014 was merged

[tersec]

#4378