fix: bdist_rpm should generate only binaries [linux]

[marcelotduarte]

cx_Freeze generates executables for distribution, so it doesn't justify distributing source code. So I removed those parts, getting a code a little easier to maintain.
Added tests.
With this cleanup, it was possible to resolve some small bugs:

• only packages could be build to executables (now a simple or a complex package can be build) and distributed to rpm.
• pytest failed because a bug related to script_name
• long description cannot be empty/none (now it get the same as description).

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.11 🎉

Comparison is base (7417928) 55.76% compared to head (3e82969) 55.88%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1945      +/-   ##
==========================================
+ Coverage   55.76%   55.88%   +0.11%     
==========================================
  Files          55       55              
  Lines        5441     5408      -33     
==========================================
- Hits         3034     3022      -12     
+ Misses       2407     2386      -21     

Impacted Files	Coverage Δ
cx_Freeze/command/bdist_rpm.py	86.45% <100.00%> (+5.82%)	⬆️

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