[CLD-7567] Deprecate Self Serve: Second Pass (#26853)

* Deprecate Self Serve: First Pass

* Fix ci

* Fix more ci

* Remmove outdated server tests

* Fix a missed spot opening purchase modal in Self Hosted

* Fix i18n

* Clean up some more server code, fix webapp test

* Fix alignment of button

* Fix linter

* Fix i18n server side

* Deprecate in product true up

* Add back translation

* Remove client functions

* Put back client functions

* webapp deprecation

* Deprecate Self Serve: Second Pass

* Fix various pipeline issues

* Fix linter

* Fix pipelines

* Fix handlers_test.go

* Fix console.error around hostedCustomer in reducer

* PICKY LINTER PLEASE

* Fix webapp tests, various other fixes for the CI pipelines

* Fix i18n

* Updates to accomadate enterprise code removal

* Fix mocks

* More removal

* Fix

* Adjustments from PR

* Fixes for QA Feedback

* Update

* Add migrations to remove true up review history

* Fix migrations check

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Co-authored-by: Mattermost Build <build@mattermost.com>
Co-authored-by: maria.nunez <maria.nunez@mattermost.com>

server/channels/db/migrations/postgres/000121_remove_true_up_review_history.down.sql

@@ -0,0 +1,5 @@
+CREATE TABLE IF NOT EXISTS trueupreviewhistory (
+	duedate bigint,
+	completed boolean,
+    PRIMARY KEY (duedate)
+);

server/channels/db/migrations/postgres/000121_remove_true_up_review_history.up.sql

@@ -0,0 +1 @@
+DROP TABLE IF EXISTS trueupreviewhistory;