Replace Hex.toHexString in logging, toString etc to safer alternative in Tests

[kishansagathiya]

Whatever was done in #1069, We might require a similar exercise in tests as well

[zilm13]

@kishansagathiya I don't think it's required. We need it in app, because complete logging is useful to find strange bugs when you have not reproducible report + on some logging levels new errors occur due to lack of safety in logging. When strange values appears in test, it's reproducible and it's a sign that test should be fixed.