imp(erc20,tests): add tests for ERC20 precompile events

[MalteHerrmann]

Description

This PR adds tests to the ERC20 precompile event emitting.

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Closes ENG-2282

[linear]

ENG-2282 Add ERC20 events unit tests

Add unit tests for the events added in PR #1982

[codecov]

Codecov Report

Merging #1984 (ffd7b67) into main (ab74c9e) will decrease coverage by 0.36%.
Report is 2 commits behind head on main.
The diff coverage is 0.00%.

❗ Current head ffd7b67 differs from pull request most recent head 6d7b866. Consider uploading reports for the commit 6d7b866 to get more accurate results

@@            Coverage Diff             @@
##             main    #1984      +/-   ##
==========================================
- Coverage   69.97%   69.62%   -0.36%     
==========================================
  Files         327      330       +3     
  Lines       24270    24477     +207     
==========================================
+ Hits        16984    17042      +58     
- Misses       6415     6557     +142     
- Partials      871      878       +7     

Files	Coverage Δ
precompiles/erc20/erc20.go	17.58% <ø> (ø)
precompiles/erc20/types.go	0.00% <ø> (ø)
precompiles/common/abi.go	0.00% <0.00%> (ø)

... and 1 file with indirect coverage changes