Fix BlocksTransactionsMismatch temporary fetcher

[pasqu4le]

Bug Fixes

This solves a problem that was found with BlocksTransactionsMismatch temporary fetcher:
block with no transactions were not taken into account, so they were not checked and never had their refetch_needed field set to false.

Additionally, a consensus filtering has been added to the AddRefetchNeededToBlock migration to save some unnecessary update in it and some checks from the temporary fetcher.

Checklist for your PR

• I added an entry to CHANGELOG.md with this PR
• If I added new functionality, I added tests covering it.
• If I fixed a bug, I added a regression test to prevent the bug from silently reappearing again.
• I checked whether I should update the docs and did so if necessary

[coveralls]

Pull Request Test Coverage Report for Build 82e98b46-04c1-4142-98c6-85fe40679b17

• 0 of 3 (0.0%) changed or added relevant lines in 1 file are covered.
• 11 unchanged lines in 5 files lost coverage.
• Overall coverage decreased (-0.2%) to 81.037%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
apps/indexer/lib/indexer/temporary/blocks_transactions_mismatch.ex	0	3	0.0%

Files with Coverage Reduction	New Missed Lines	%
apps/indexer/lib/indexer/temporary/blocks_transactions_mismatch.ex	1	0.0%
apps/indexer/lib/indexer/fetcher/token.ex	1	78.57%
apps/indexer/lib/indexer/fetcher/token_balance.ex	2	87.1%
apps/indexer/lib/indexer/block/fetcher.ex	3	87.84%
apps/indexer/lib/indexer/block/catchup/fetcher.ex	4	69.23%

Totals
Change from base Build ae1c527a-460d-4beb-a514-abe8b88d1fe8:	-0.2%
Covered Lines:	4718
Relevant Lines:	5822

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💛 - Coveralls