Improve robustness of RelayLegacyDtoSchema

[iamacook]

Summary

This changes the mock data of chainId in the RelayLegacyDtoSchema test to always be alpha, not alphanumeric, as the latter could return a numerical string.

[coveralls]

Pull Request Test Coverage Report for Build 8598655615

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 4 unchanged lines in 1 file lost coverage.
• Overall coverage remained the same at 92.64%

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

Totals
Change from base Build 8568151290:	0.0%
Covered Lines:	6599
Relevant Lines:	6879

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💛 - Coveralls