CIF-2038 - Migrate to CircleCI contexts

[herzog31]

Description

• Migrate use of secrets and credentials to CircleCI contexts

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [X] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [X] I have signed the Adobe Open Source CLA.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [X] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes and the overall coverage did not decrease.
• [X] All unit tests pass on CircleCi.
• [X] I ran all tests locally and they pass.

[codecov[bot]]

Codecov Report

Merging #178 (40d1b21) into master (315c0b1) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #178   +/-   ##
=========================================
  Coverage     87.86%   87.86%           
  Complexity      534      534           
=========================================
  Files            38       38           
  Lines          2019     2019           
  Branches        319      319           
=========================================
  Hits           1774     1774           
  Misses          104      104           
  Partials        141      141           

Flag	Coverage Δ
integration	46.90% <ø> (ø)
karma	96.55% <ø> (ø)
unittests	84.15% <ø> (ø)

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