Enable Rohde&Schwarz ZNLE VNA

[FKMalina]

This pull request includes minor changes to Rohde&Schwarz VNA driver, making it compatible with a family of the budget R&S VNA (ZNLE).

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[jenshnielsen]

These short names are soft deprecated so let's not add them for new instruments.

Rather please create classes of the form RohdeSchwarzZNLE3 in a private file _rohde_schwarz_znle.py
and add the imports of these files to the __init__.py file in the folder.

[jenshnielsen]

@FKMalina Thanks for the contribution. Looks good. Please fix the small issues pointed out by the precommit hooks and my inline comment and then this should be good to merge

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 69.38%. Comparing base (d06b5de) to head (1a397fb).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/qcodes/instrument_drivers/rohde_schwarz/ZNB.py	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6796      +/-   ##
==========================================
- Coverage   69.39%   69.38%   -0.01%     
==========================================
  Files         340      341       +1     
  Lines       31335    31341       +6     
==========================================
+ Hits        21744    21747       +3     
- Misses       9591     9594       +3     

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