CopilotStudio Client WebChat sample failure when `cloud` is not set

[rido-min]

Following the README for the copilotstudio-webchat sample

Agents-for-js/test-agents/copilotstudio-webchat/README.md

Lines 53 to 57 in ad6cf18

	2. Fill in the values you recorded during setup:
	- `environmentId`: The Copilot Studio Environment Id.
	- `agentIdentifier`: The Copilot Studio Schema name.
	- `tenantId`: The App Registration Directory (tenant) ID.
	- `appClientId`: The App Registration Application (client) ID.

I got the next error when trying to acquire the token

index.js:29  Failed to initialize: Error: Invalid cluster category value: -1
    at Qi (powerPlatformEnvironment.ts:263:13)
    at He.Qf [as scopeFromSettings] (powerPlatformEnvironment.ts:150:23)
    at acquireToken (acquireToken.js:18:34)
    at async index.js:15:17
(anonymous) @ index.js:29

I was able to fix the issue by setting the cloud to 5, seems like an issue introduced in #415

Can we provide a default value for cloud? or at least update the README to indicate the required settings

We should also verify scopeFromSettings works with directUrl

[rido-min]

@MattB-msft do you have any suggestions here? Can we use the default value of cloud as Prod (that's the value '5' in our enum?

[sw-joelmut]

@MattB-msft do you have any suggestions here? Can we use the default value of cloud as Prod (that's the value '5' in our enum?

We are looking into it to better handle these type of connection settings, we'll default to 'Prod'.

[rido-min]

we can use this issue to tackle #17