More Basic auth demise for ExO

[chrisda]

SCC still uses RPS and V1 Module is still OK (no REST API backed cmdlets yet in SCC PowerShell).

[learn-build-service-prod]

Learn Build status updates of commit e8c6868:

✅ Validation status: passed

File	Status	Preview URL	Details
.openpublishing.redirection.json	✅Succeeded
exchange/docs-conceptual/connect-to-exchange-online-powershell.md	✅Succeeded	View (exchange-ps)
exchange/docs-conceptual/connect-to-exchange-online-protection-powershell.md	✅Succeeded	View (exchange-ps)
exchange/docs-conceptual/connect-to-scc-powershell.md	✅Succeeded	View (exchange-ps)
exchange/docs-conceptual/exchange-online-powershell-v2.md	✅Succeeded	View (exchange-ps)
exchange/docs-conceptual/toc.yml	✅Succeeded	View (exchange-ps)
exchange/docs-conceptual/v1-module-mfa-connect-to-exo-powershell.md	✅Succeeded	n/a (file deleted or renamed)
exchange/docs-conceptual/v1-module-mfa-connect-to-scc-powershell.md	✅Succeeded	View (exchange-ps)

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