[Do-Not-Merge] Ignore sagemaker-uploading

[NihalHarish]

Description of changes:

• We should ignore special status files that can be added by Sagemaker before determining if we should update the checkpointing directory.

Style and formatting:

I have run pre-commit install to ensure that auto-formatting happens with every commit.

Issue number, if available

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[codecov-io]

Codecov Report

Merging #470 (2897643) into master (1aac94b) will decrease coverage by 15.52%. The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           master     #470       +/-   ##
===========================================
- Coverage   65.53%   50.00%   -15.53%     
===========================================
  Files         173      163       -10     
  Lines       13280    12934      -346     
===========================================
- Hits         8703     6468     -2235     
- Misses       4577     6466     +1889     

Impacted Files	Coverage Δ
smdebug/core/state_store.py	77.58% <ø> (-3.45%)	:arrow_down:
smdebug/_version.py	100.00% <100.00%> (ø)
smdebug/tensorflow/__init__.py	0.00% <0.00%> (-100.00%)	:arrow_down:
smdebug/tensorflow/constants.py	0.00% <0.00%> (-100.00%)	:arrow_down:
smdebug/tensorflow/singleton_utils.py	0.00% <0.00%> (-100.00%)	:arrow_down:
smdebug/tensorflow/collection.py	0.00% <0.00%> (-95.88%)	:arrow_down:
smdebug/tensorflow/session.py	0.00% <0.00%> (-91.83%)	:arrow_down:
smdebug/tensorflow/keras.py	0.00% <0.00%> (-89.30%)	:arrow_down:
smdebug/tensorflow/tensor_ref.py	0.00% <0.00%> (-88.71%)	:arrow_down:
smdebug/tensorflow/utils.py	0.00% <0.00%> (-86.26%)	:arrow_down:
... and 57 more

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