REV: Remove the AtomBasisKey.alias field again

[BvB93]

Removed again, as it makes membership checks a lot more difficult in SCM-NV/nano-qmflows#353.

[codecov]

Codecov Report

Merging #285 (3661d3e) into master (3f6741c) will decrease coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #285      +/-   ##
==========================================
- Coverage   82.04%   82.00%   -0.05%     
==========================================
  Files          42       42              
  Lines        2206     2201       -5     
  Branches      369      368       -1     
==========================================
- Hits         1810     1805       -5     
  Misses        306      306              
  Partials       90       90              

Impacted Files	Coverage Δ
src/qmflows/common.py	94.73% <ø> (-0.14%)	⬇️
src/qmflows/parsers/_cp2k_basis_parser.py	98.03% <100.00%> (-0.15%)	⬇️

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