Refactor amplify methods to single file

[bangbay-bluetiger]

Description

Amplify typically has breaking changes with each version upgrade. To mitigate how much refactoring we have to do with each upgrade, we should use generic helpers and call amplify methods from a single file, as much as possible.

Other changes in this PR:

• Add a 204 response code for banner not found so it doesn't give an error console output
• Convert deprecated atob and btoa

Related ticket(s)

CMDCT-4037

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How to test

• Everything in the app works as expected. A short list of everything:
  • all api calls
  • auth
  • timeout
  • template file download
• Automated tests pass

Notes

Left in uses of AnyObject where there's a TODO to replace them. Because of that, I needed to cast to ReportShape in a couple of places. I put TODOs as a reminder to remove the casting when the AnyObject conversion happens.

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Pre-review checklist

• I have added thorough tests, if necessary
• I have updated relevant documentation, if necessary
• I have performed a self-review of my code
• I have manually tested this PR in the deployed cloud environment

[codeclimate]

Code Climate has analyzed commit 10b8e9f and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (90% is the threshold).

This pull request will bring the total coverage in the repository to 93.8% (0.0% change).

View more on Code Climate.

[gmrabian]

great work! ⭐