chore: set separate configs for lint e2e (mocha) and jest

### What is this about?

Set separate configs for lint e2e (mocha) and jest. This is what the following PR intended, but it broke the lint validations for our test folder so it has been reverted

https://github.com/MetaMask/metamask-extension/pull/31049

### Scenario

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### Design

_No response_

### Technical Details

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### Threat Modeling Framework

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### Acceptance Criteria

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### Stakeholder review needed before the work gets merged

- [ ] Engineering (needed in most cases)
- [ ] Design
- [ ] Product
- [ ] QA (automation tests are required to pass before merging PRs but not all changes are covered by automation tests - please review if QA is needed beyond automation tests)
- [ ] Security
- [ ] Legal
- [ ] Marketing
- [ ] Management (please specify)
- [ ] Other (please specify)

### References

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Start by reviewing reverted PR #31049 and the repository's current lint configuration and test-folder validation setup. Done means linting has separate configurations for the Mocha end-to-end tests and Jest, while the existing test-folder lint validations pass.

Written by the indexing model from the issue text.