[Docs] Workspace Manager and Workspace Admin Roles

[leecalcote]

Current State

Two new roles have become available as of Cloud v0.7.176.

Desired State

Both of these roles, their purpose, and their default permissions are documented.

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[leecalcote]

@Yashsharma1911 are these permissions being published?

[Yashsharma1911]

@Yashsharma1911 are these permissions being published?

For user role yes, for workspace manager and admin no, it will require small change to publish these too @dragon-slayer875