fix(e2e): add ability to read debug feature toggles from local storage

[lismith2-cisco]

COMPLETES # https://jira-eng-gpk2.cisco.com/jira/browse/SPARK-760805

This pull request addresses

Makes it easier to reliably add debug feature toggles in all circumstances e.g. crosslaunch guest join. This is useful for e2e tests and bug bashes.

by making the following changes

• provides a utility function to get debug feature toggles from storage, converted into the expected format
• uses that utility function in processRegistrationSuccess function to add debug feature toggles to the response before storing them
• clears the etag on config load if there are debug feature toggles, to ensure the developer toggles are sent from the back end and processed.
• Also moves installationId in config which was misplaced

Change Type

• 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)
• Documentation update
• Tooling change
• Internal code refactor

The following scenarios were tested

tested logged in and guest users, manually and with unit tests

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• This PR is related to
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  • Defect fix
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• All existing and new tests passed
• I have updated the documentation accordingly

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