[AAE-4966] Extensible app config

[DenysVuika]

Please check if the PR fulfills these requirements

• The commit message follows our guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

What kind of change does this PR introduce? (check one with "x")

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation
• Other... Please describe:

What is the current behaviour? (You can also link to an open issue here)

What is the new behaviour?

• support for updating App Config from the extensions ("appConfig" property)
• cleanup the incorrect usage of the service injection in ADF unit tests (stability and less refactorings in the future)

Does this PR introduce a breaking change? (check one with "x")

• Yes
• No

If this PR contains a breaking change, please describe the impact and migration path for existing applications: ...

Other information:
https://alfresco.atlassian.net/browse/AAE-4966

[mauriziovitale]

Do we have an issue linked that contains the AC? Once merged, who is gonna test it and based on what? We should have examples and expectations
fileExtension1
fileExtension2

result

[DenysVuika]

@mauriziovitale the issue is https://alfresco.atlassian.net/browse/AAE-4966

This code is needed for https://alfresco.atlassian.net/browse/AAE-4842. The service has unit tests, the corresponding UI in the Modeling app will be testable.

[codecov-io]

Codecov Report

Merging #6914 (159a330) into develop (c120526) will increase coverage by 0.08%.
The diff coverage is 80.00%.

❗ Current head 159a330 differs from pull request most recent head 62f139d. Consider uploading reports for the commit 62f139d to get more accurate results

@@             Coverage Diff             @@
##           develop    #6914      +/-   ##
===========================================
+ Coverage    76.56%   76.65%   +0.08%     
===========================================
  Files          887      887              
  Lines        20227    20272      +45     
  Branches      4030     4042      +12     
===========================================
+ Hits         15487    15539      +52     
+ Misses        3499     3488      -11     
- Partials      1241     1245       +4     

Impacted Files	Coverage Δ
lib/core/app-config/debug-app-config.service.ts	12.50% <0.00%> (ø)
lib/core/testing/core.testing.module.ts	100.00% <ø> (ø)
...ib/testing/process-service-cloud.testing.module.ts	100.00% <ø> (ø)
...services/src/lib/testing/process.testing.module.ts	100.00% <ø> (ø)
lib/core/app-config/app-config.service.ts	88.00% <83.33%> (-0.58%)	⬇️
lib/core/mock/alfresco-api.service.mock.ts	88.88% <100.00%> (ø)
lib/core/mock/app-config.service.mock.ts	100.00% <100.00%> (ø)
lib/core/mock/search.service.mock.ts	100.00% <100.00%> (ø)
...b/extensions/src/lib/services/extension.service.ts	83.60% <100.00%> (+0.84%)	⬆️
...ib/process-list/services/process-filter.service.ts	90.90% <100.00%> (ø)
... and 13 more

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[pmartinezga]

Minor comment