Data Audit MixPanel

Copied from [mobile](https://github.com/MetaMask/mobile-planning/issues/510)

## Description
Review the current MixPanel platform configuration for current logging behavior. Look for potential PII information.

## Technical Details

- Review current MixPanel data for any information that could be used to identify a person if aggregated within MixPanel
- Need to check JS and confirm that levels the logging is turned off
- Suggest using Proxyman (or other proxy) to watch network traffic as a way to confirm
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## Acceptance Criteria

- No data is logged when user opts-out verify with Proxyman
- No MixPanel data cannot be combine with other MixPanel data to identify someone (i.e. device id and logged out data)
- Remove any identifiable fields in MixPanel if something has been discovered

## References

- PII Reference: https://help.mixpanel.com/hc/en-us/articles/360000679006-Managing-Personal-Information

Review the current MixPanel platform configuration and JavaScript logging behavior first. Use Proxyman or another proxy to verify that opt-out prevents MixPanel traffic, then inspect the captured data for PII or combinations that could identify a person. Done means no opt-out data is sent and any identifiable MixPanel fields are removed.

Written by the indexing model from the issue text.