[MM-55014][MM-55015] Add last login timestamp for users, add materialized view and refresh job to keep track of post stats for Postgres (#25152)

* [MM-55014][MM-55015] Add last login timestamp for users, add materialized view and refresh job for Postgres

* Check fixes

* Fix type issue

* Add verification that lastlogin was updated

* PR feedback

* Morge'd

* Morge'd again

* Merge'd

* Update admin setting strings

* WIP

* PR feedback

* Oops

* Fix i18n

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

server/channels/db/migrations/postgres/000115_user_reporting_changes.down.sql

@@ -0,0 +1,3 @@
+DROP MATERIALIZED VIEW IF EXISTS poststats;
+
+ALTER TABLE users DROP COLUMN IF EXISTS lastlogin;

server/channels/db/migrations/postgres/000115_user_reporting_changes.up.sql

@@ -0,0 +1,7 @@
+ALTER TABLE users ADD COLUMN IF NOT EXISTS lastlogin bigint NOT NULL DEFAULT 0;
+
+CREATE MATERIALIZED VIEW IF NOT EXISTS poststats AS
+SELECT userid, to_timestamp(createat/1000)::date as day, COUNT(*) as numposts, MAX(CreateAt) as lastpostdate
+FROM posts 
+GROUP BY userid, day
+;