Remove rename() task and unnecessary code from rename_results()

[hackdna]

No description provided.

[codecov]

Codecov Report

Merging #2725 into develop will decrease coverage by 0.65%.
The diff coverage is 28.57%.

@@             Coverage Diff             @@
##           develop    #2725      +/-   ##
===========================================
- Coverage    56.48%   55.82%   -0.66%     
===========================================
  Files          398      398              
  Lines        25957    25402     -555     
  Branches      1239     1239              
===========================================
- Hits         14662    14181     -481     
+ Misses       11295    11221      -74

Impacted Files	Coverage Δ
refinery/file_store/tasks.py	30% <ø> (-4.83%)	⬇️
refinery/core/models.py	73.04% <28.57%> (-4.26%)	⬇️
refinery/tool_manager/tasks.py	100% <0%> (ø)	⬆️
refinery/tool_manager/views.py	96.22% <0%> (+1.32%)	⬆️

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