[MM-52926] Deprecating work templates (#23466)

Co-authored-by: Mattermost Build <build@mattermost.com>

server/public/model/onboarding.go

@@ -11,7 +11,6 @@ import (
 // CompleteOnboardingRequest describes parameters of the requested plugin.
 type CompleteOnboardingRequest struct {
 	Organization   string   `json:"organization"`    // Organization is the name of the organization
-	Role           string   `json:"role"`            // Role is the role selected by first admin
 	InstallPlugins []string `json:"install_plugins"` // InstallPlugins is a list of plugins to be installed
 }