Handling lists in ``flat-table``

### 📝 Description of the feature

Lists are not handled in ``flat-table`` as ``\n`` are modified into spaces.

References
-----------

- ``etable``: https://github.com/ansys/pymapdl/pull/3983#discussion_r2136010077
```
- Contact status: * 3 = closed and sticking * 2 = closed and sliding * 1 = open but near contact * 0 = open and not near contact
```
- ``plesol``: https://github.com/ansys/pymapdl/pull/4003#discussion_r2142313357
```
- Number of the maximum-failure criterion over the entire element: * 1 = EMAX * 2 = SMAX * 3 = TWSI * 4 = TWSR * 5
```

### 💡 Steps for implementing the feature

_No response_

### 🔗 Useful links and references

_No response_

Start by locating the flat-table implementation and tracing how newline characters are converted to spaces. Review the etable and pl esol references for the list formats that currently fail. Done means lists in flat-table preserve their intended structure instead of being flattened into spaces; no test file is named in the issue.

Written by the indexing model from the issue text.