Remove app fields: ldap,saml,notification,accountMigration

Description

This fields just shadow the server fields and cause race conditions during the app initialization. They should just directly call into server fields, and simplify the whole app initialization.

QA Test Steps

General smoke tests

Mana

None

Assignee

Agniva De Sarker

QA Assignee

None

Reporter

Agniva De Sarker

Epic Link

Fix versions

Mattermost Team

Platform

Sprint

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Labels

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QA Testing Areas

Other (write in QA test steps)

GitHub Issue

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Components

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