upcase all keys before storing in .env

[purplecabbage]

Description

Related Issue

Confusing lowercase .env keys adobe/aio-cli

I have not updated the tests as this really just means upcasing all the fixtures and I want to be sure there are no unexpected side-effects before heavy handedly making the tests pass.

Motivation and Context

I was confused ... I still am about this key:
AIO_ims_contexts_Credential__in__Jesse__Is__Back__-__Stage_client__id

- is not valid in an identifier/property name, so this becomes:
( note the ticks )

  AIO_RUNTIME_APIHOST: 'https://adobeioruntime.net',
  'AIO_IMS_CONTEXTS_CREDENTIAL__IN__JESSE__IS__BACK__-__STAGE_CLIENT__ID': ...

How Has This Been Tested?

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 code follows the code style of this project.
• 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.
• All new and existing tests passed.