Remove features `test_tools` and `full` from `mithril-client`

## Why
In order to enhance build times by better build artifact reuse, we want to remove all features from `mithril-common`. With the work done in #2580 we can now remove the `test_tools` feature and the `full` features.

## What
Remove the `test_tools` and `full` features from the `mithril-common` crate.

## How

- [x] Remove the `test_tools` and `full` features from `mithril-common`