feat: rename e2eutil to util

[gaius-qi]

Description

Related Issue

Motivation and Context

Screenshots (if appropriate)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation Update (if none of the other choices apply)

Checklist

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 51.91%. Comparing base (8ec6305) to head (d5a020c).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3122      +/-   ##
==========================================
- Coverage   51.93%   51.91%   -0.02%     
==========================================
  Files         163      163              
  Lines       18600    18600              
==========================================
- Hits         9659     9657       -2     
- Misses       8278     8279       +1     
- Partials      663      664       +1     

Flag	Coverage Δ
unittests	51.91% <ø> (-0.02%)	⬇️

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see 1 file with indirect coverage changes