Fetch balance only for blocks which are greater or equal block with FIRST_BLOCK number

[vbaranov]

Motivation

Eliminate requests to the node for blocks which state doesn't exist on the node. Example of response from such failed request from Nethermind archive node:

0x58bad7cf29428c3d17cb859f5c580d3c25f134cd@�: (-32002) No state available for block 0x56c39d10e519eda9e8c0175c2f9d0c25ec41c18ddd870febcf6e05d5410327a7

Changelog

Take into consideration FIRST_BLOCK environment variable in getting coin balances for the address at the block. Specifically, make a request only if the block number is greater or equal to the FIRST_BLOCK param.

Checklist for your Pull Request (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 by submitting a PR to https://github.com/blockscout/docs
• If I added/changed/removed ENV var, I submitted a PR to https://github.com/blockscout/docs to update the list of env vars at https://github.com/blockscout/docs/blob/master/for-developers/information-and-settings/env-variables.md and I updated the version to master in the Version column. Changes will be reflected in this table: https://docs.blockscout.com/for-developers/information-and-settings/env-variables.
• If I add new indices into DB, I checked, that they are not redundant with PGHero or other tools

[coveralls]

Pull Request Test Coverage Report for Build 02310b9a-cf34-4538-8161-4afdcb95d551

• 7 of 7 (100.0%) changed or added relevant lines in 1 file are covered.
• 7 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+0.02%) to 75.079%

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Files with Coverage Reduction	New Missed Lines	%
apps/block_scout_web/lib/block_scout_web/controllers/chain/market_history_chart_controller.ex	2	71.43%
apps/explorer/lib/explorer/chain_spec/genesis_data.ex	5	9.09%

Totals
Change from base Build 3a7e398e-110e-49f3-8c1e-5b616d77a0be:	0.02%
Covered Lines:	5712
Relevant Lines:	7608

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💛 - Coveralls