Increase endpoint creation timeouts to 35 minutes for all tests

[winstonaws]

This will reduce transient failures for our tests. Usually endpoint creation happens in ~10 minutes, but occasionally it can go up to ~30 minutes arbitrarily.

If the sagemaker endpoint creation is fast but our container fails to start up, we will still fail fast.

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[yangaws]

Thanks!

[codecov-io]

Codecov Report

Merging #158 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #158   +/-   ##
=======================================
  Coverage   90.48%   90.48%           
=======================================
  Files          36       36           
  Lines        2438     2438           
=======================================
  Hits         2206     2206           
  Misses        232      232

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