[Integrates] Update notifications about Group created

Problem to solve

At this time, when someone creates a new group on Platform, a notification about Group created is sent via email. However, inside this notification still is used the old word ARM, making reference to Platform:

Intended users

All

Proposal

Update the Group created notification, so that the old ARM term is no longer used to refer to the Platform. It could be:

Changing the ARM word to Platform, or...
Removing the through ARM phrase

Test plan

Steps

Make sure that the code contributions checklist has been followed.

Links / references

https://help.fluidattacks.com/agent/fluid4ttacks/fluid-attacks/tickets/details/944043000002823002

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