Rework `TxStatusManager` tests (#2871)

Closes https://github.com/FuelLabs/fuel-core/issues/2837

## Description
This PR makes the tests for `TxStatusManager` more lean. Mainly it
removes duplication of tests (some tests were testing for the same
thing, but in slightly different way) and covers some more cases.

## Checklist
- [X] New behavior is reflected in tests

### Before requesting review
- [X] I have reviewed the code myself

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Co-authored-by: Green Baneling <XgreenX9999@gmail.com>