caliper-ethereum : Add new tests for `connectorFactory` and `ethereum-connector`

[Sweetdevil144]

Added test cases for caliper-ethereum package Ready for Review

Checklist

• [x] A link to the issue/user story that the pull request relates to~ #1556
• [ ] How to recreate the problem without the fix
• [ ] Design of the fix
• [ ] How to prove that the fix works
• [ ] Automated tests that prove the fix keeps on working
• [ ] Documentation - any JSDoc, website, or Stackoverflow answers?

Issue/User story

Steps to Reproduce

1. cd packages/caliper-ethereum && npm i && npm run dev

Existing issues

• [ ] Stack Overflow issues
• [x] GitHub Issues
• [ ] Discord history

Design of the fix

Validation of the fix

Automated Tests

What documentation has been provided for this pull request