[MM-59483] Remove legacy preload and custom login code #3174
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Summary
This PR removes code in the Desktop App that was left to support older versions of the Mattermost Server/Web App:
window.postMessage
, needed for server versions <v9.4What this does mean is that as of this change, Mattermost servers running versions under v9.4 will now have a reduced experience, and may or may not function at all. We will be dropping support for those server versions in the Desktop App officially as of v5.11.
This is being done to both reduce complication, improve security (in the case of custom logins) and potentially improve performance (in the case of the preload script changes)
Ticket Link
https://mattermost.atlassian.net/browse/MM-59843