Remove get_temp_dir()

[hackdna]

Close #3028. Also, remove FILE_STORE_TEMP_DIR and FILE_UPLOAD_TEMP_DIR Django settings. Toward #3052.

[codecov]

Codecov Report

Merging #3178 into develop will decrease coverage by 0.19%.
The diff coverage is 75%.

@@            Coverage Diff             @@
##           develop    #3178     +/-   ##
==========================================
- Coverage    61.98%   61.79%   -0.2%     
==========================================
  Files          438      438             
  Lines        27784    27493    -291     
  Branches      1285     1285             
==========================================
- Hits         17222    16989    -233     
+ Misses       10562    10504     -58

Impacted Files	Coverage Δ
refinery/file_store/test_models.py	100% <ø> (ø)	⬆️
refinery/file_store/models.py	79.22% <ø> (-3.84%)	⬇️
refinery/file_store/tasks.py	58.37% <66.66%> (-1.69%)	⬇️
refinery/data_set_manager/views.py	62.1% <80%> (-0.25%)	⬇️
refinery/file_store/utils.py	68.93% <0%> (-0.05%)	⬇️
refinery/tool_manager/tests.py	99.77% <0%> (-0.01%)	⬇️
refinery/tool_manager/utils.py	100% <0%> (ø)	⬆️
... and 1 more

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