Please unify the emails when provider suggests a new consultation time

[Gaskevych]

When provider reschedules a session, two emails are sent - one that the session has been canceled, and the second one that the new time has been suggested. Please combine them, so the provider receives only one message.

[7Digit-main]

@Gaskevych - only one message is received now.

The flow diagrams are updated to GitBook documentation:
For Providers - https://app.gitbook.com/o/ZKO9HovNEyDHquAQOVSf/s/5PEN3r6zeJ5DMrOSH2sB/~/edit/~/changes/72/ui-usage-manuals/provider#id-7.2.-edit-scheduled-consultations Figure 14
For Clients - https://app.gitbook.com/o/ZKO9HovNEyDHquAQOVSf/s/5PEN3r6zeJ5DMrOSH2sB/~/edit/~/changes/72/ui-usage-manuals/client#id-5.-edit-consultation Figure 23