CIF-2097 - Consume the configured custom HTTP headers in MagentoGraphqlClient

[dplaton]

Description

Users may configure additional HTTP headers to be sent with each Graphql request, via the CIF HTTP Custom Headers configuration service and the cloud service configuration. This PR updates the MagentoGraphqlClient to consume custom HTTP headers from the CA config.

Related Issue

CIF-2097

Motivation and Context

Allow the components to consume the custom HTTP headers.

How Has This Been Tested?

Unit testing, functional testing

Screenshots (if appropriate):

Types of changes

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

Checklist:

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

[herzog31]

@dplaton @mhaack should this be added to the client-side components via [0][1][2] as well?

[0] https://github.com/adobe/aem-cif-guides-venia/blob/dev/ui.frontend/src/main/components/App/App.js#L38-L47
[1] https://github.com/adobe/aem-core-cif-components/blob/master/react-components/src/components/App/app.js#L38
[2] https://github.com/adobe/aem-core-cif-components/blob/master/bundles/core/src/main/java/com/adobe/cq/commerce/core/components/models/storeconfigexporter/StoreConfigExporter.java

[codecov]

Codecov Report

Merging #596 (46ff8fd) into master (03db3d1) will increase coverage by 0.00%.
The diff coverage is 86.66%.

@@            Coverage Diff            @@
##             master     #596   +/-   ##
=========================================
  Coverage     87.90%   87.90%           
- Complexity     1363     1372    +9     
=========================================
  Files           249      250    +1     
  Lines          6410     6435   +25     
  Branches        961      964    +3     
=========================================
+ Hits           5635     5657   +22     
- Misses          580      583    +3     
  Partials        195      195           

Flag	Coverage Δ
integration	64.00% <26.92%> (-0.30%)	⬇️
jest	85.34% <0.00%> (ø)
karma	94.83% <100.00%> (+<0.01%)	⬆️
unittests	87.09% <88.46%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
react-components/src/components/App/app.js	12.50% <0.00%> (ø)
react-components/src/context/ConfigContext.js	100.00% <ø> (ø)
...1/storeconfigexporter/StoreConfigExporterImpl.java	83.33% <62.50%> (-7.58%)	⬇️
...erce/core/components/client/DeniedHttpHeaders.java	100.00% <100.00%> (ø)
...e/core/components/client/MagentoGraphqlClient.java	91.17% <100.00%> (+1.52%)	⬆️
...ore/cif/clientlibs/common/js/CommerceGraphqlApi.js	83.33% <100.00%> (+0.35%)	⬆️

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[dplaton]

@dplaton @mhaack should this be added to the client-side components via [0][1][2] as well?

I updated the StoreConfigExporter now, I'll update the components soon.