[MM-55017] Add API method to get users for Admin Reporting (#25499)

* Add store method to get reporting data

* Some store changes

* Added app layer

* Added API call, some miscellaneous fixes

* Fix lint

* Fix serialized check

* Add API docs

* Fix user store tests leaking users

* Fix test

* PR feedback

* Add filtering for role/team/activated user, filter out bot users

* Fix mock

* Fix test

* Oops

* Switch to using struct filter

* More PR feedback

* Fix gen

* Fix test

* Fix API docs

* Fix test

* Fix possible SQL injection, some query optimization

* Fix migrations

* Oops

* Add role to API

* Fix check

* Add Client4 API call for load testing

* Fix test

* Update server/channels/store/storetest/user_store.go

Co-authored-by: Ibrahim Serdar Acikgoz <serdaracikgoz86@gmail.com>

* PR feedback

---------

Co-authored-by: Mattermost Build <build@mattermost.com>
Co-authored-by: Ibrahim Serdar Acikgoz <serdaracikgoz86@gmail.com>

server/channels/db/migrations/migrations.list

@@ -232,6 +232,8 @@ channels/db/migrations/mysql/000116_create_outgoing_oauth_connections.down.sql
 channels/db/migrations/mysql/000116_create_outgoing_oauth_connections.up.sql
 channels/db/migrations/mysql/000117_msteams_shared_channels.down.sql
 channels/db/migrations/mysql/000117_msteams_shared_channels.up.sql
+channels/db/migrations/mysql/000118_create_index_poststats.down.sql
+channels/db/migrations/mysql/000118_create_index_poststats.up.sql
 channels/db/migrations/postgres/000001_create_teams.down.sql
 channels/db/migrations/postgres/000001_create_teams.up.sql
 channels/db/migrations/postgres/000002_create_team_members.down.sql
@@ -464,3 +466,5 @@ channels/db/migrations/postgres/000116_create_outgoing_oauth_connections.down.sq
 channels/db/migrations/postgres/000116_create_outgoing_oauth_connections.up.sql
 channels/db/migrations/postgres/000117_msteams_shared_channels.down.sql
 channels/db/migrations/postgres/000117_msteams_shared_channels.up.sql
+channels/db/migrations/postgres/000118_create_index_poststats.down.sql
+channels/db/migrations/postgres/000118_create_index_poststats.up.sql

server/channels/db/migrations/mysql/000118_create_index_poststats.down.sql

@@ -0,0 +1 @@
+-- Nothing to do for MySQL

server/channels/db/migrations/mysql/000118_create_index_poststats.up.sql

@@ -0,0 +1 @@
+-- Nothing to do for MySQL

server/channels/db/migrations/postgres/000118_create_index_poststats.down.sql

@@ -0,0 +1 @@
+DROP INDEX IF EXISTS idx_poststats_userid;

server/channels/db/migrations/postgres/000118_create_index_poststats.up.sql

@@ -0,0 +1,2 @@
+-- morph:nontransactional
+CREATE INDEX CONCURRENTLY IF NOT EXISTS idx_poststats_userid ON poststats(userid)