Delete fabfile.py

[cclauss]

As discussed in #18760

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As discussed in #18760

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[sympy-bot]

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Hi, I am the SymPy bot (v157). I've noticed that some of your commits add or delete files. Since this is sometimes done unintentionally, I wanted to alert you about it.

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The following commits delete files:

• c34f4c1:
  • release/fabfile.py

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[codecov]

Codecov Report

Merging #18761 into master will decrease coverage by 0.018%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##            master    #18761       +/-   ##
=============================================
- Coverage   75.663%   75.645%   -0.019%     
=============================================
  Files          647       647               
  Lines       168438    168438               
  Branches     39686     39686               
=============================================
- Hits        127446    127415       -31     
- Misses       35434     35467       +33     
+ Partials      5558      5556        -2     

[oscarbenjamin]

I'm not sure we want to delete this yet as not everything is transferred over to the new release script

[oscarbenjamin]

I'm going to close this for now. When work is done to transfer things from the fabfile to the new release script this file can be deleted.

Thank you for taking the time to write this patch.