Map historical transactions before grouping them

[iamacook]

Summary

This simplifies the mapping of historical transactions in preparation for tackling address poisoning, breaking down #1428.

We currently group domain transactions "as is". This means that we have duplicate logic for extracting the timestamp of domain transactions (of varying types) that is otherwise done in their respective mappers, e.g. for multisig transactions.

This maps domain transactions before grouping them, as well as simplifying the grouping logic. (This will allow for simpler filtering of address poisoning attempts as all transactions will be the same type.)

Changes

• Change mapGroupTransactions to only map singular transaction (mapTransaction)
• Map previous transaction (for date label calculation) if it exists
• Map domain transactions before grouping them
• Simplify grouping logic
• Update tests accordingly (the mock data has always been wrong)

[coveralls]

Pull Request Test Coverage Report for Build 8989009054

Details

• 28 of 33 (84.85%) changed or added relevant lines in 1 file are covered.
• 4 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.04%) to 92.191%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/routes/transactions/mappers/transactions-history.mapper.ts	28	33	84.85%

Files with Coverage Reduction	New Missed Lines	%
src/routes/transactions/entities/tests/human-description.builder.ts	4	60.0%

Totals
Change from base Build 8923924899:	-0.04%
Covered Lines:	6885
Relevant Lines:	7203

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💛 - Coveralls