Rename platform binary to mattermost

Description

Write a new platform binary that yells at you that you should switch to using the mattermost binary, then runs the mattermost binary.

QA Test Steps

No testing required.

Mana

4

Assignee

Christopher Speller

QA Assignee

Lindy Isherwood

Reporter

Jason Blais

Epic Link

None

Fix versions

Mattermost Team

ABC

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GitHub Issue

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