Adding support for /internal/clear_cache

[abellotti]

• Adding support for /internal/clear_cache, this triggers a cache clear for deleting all cached keys.

For: #1264

[codecov]

Codecov Report

Merging #1388 (bed79e4) into master (7254457) will increase coverage by 0.01%.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1388      +/-   ##
==========================================
+ Coverage   97.36%   97.38%   +0.01%     
==========================================
  Files         202      203       +1     
  Lines       16712    16742      +30     
  Branches     1041     1041              
==========================================
+ Hits        16272    16304      +32     
+ Misses        285      284       -1     
+ Partials      155      154       -1     

Impacted Files	Coverage Δ
cloudigrade/internal/urls.py	96.29% <ø> (ø)
...oudigrade/internal/tests/views/test_clear_cache.py	100.00% <100.00%> (ø)
cloudigrade/internal/views.py	91.94% <100.00%> (+0.28%)	⬆️
cloudigrade/api/tasks/synthesize.py	98.19% <0.00%> (+1.20%)	⬆️

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[abellotti]

In addition to the LocMemCache py39 tests, I've manually tested running locally as well as port forwarding to an Ephemeral deployment (both Redis).

[abellotti]

/retest