[MM-42191]: Include deleted posts (#19985)

* MM-42191: Include deleted posts: Add includeDeleted query parameter for getPostsForChannel

* MM-42191: Fix error typo for includeDeleted query parameter

* MM-42191: Include deleted posts: Set permission error when deleted posts are requested by non system admins

* MM-42191: Include deleted posts: Refactor replyCountSubQuery and conditions when includeDeleted is not presented, refactor getRootPosts

* MM-42191: Include deleted posts: Refactor getRootPosts function along with skipFetchThreads and includeDeleted

* MM-42191: Include deleted posts: Rename includeDeleted to include_deleted param

* MM-42191: Include deleted posts: Fix failed posts unit tests

* MM-42191: Include deleted posts: Add missing include deleted option in multiple queries

* MM-42191: Include deleted posts: Add tests for include deleted option in TestGetPostsForChannel, TestGetPostsBefore, TestGetPostsAfter

* MM-42191: include deleted posts: Add tests cases for post store test

* MM-42191: Include deleted posts: Add extra unit test to ensure not returning deleted posts when IncludeDelete is false

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

api4/team_test.go

@@ -3028,7 +3028,7 @@ func TestImportTeam(t *testing.T) {
 		require.NoError(t, err)
 		require.Equal(t, importedChannel.Name, "general", "names did not match expected: general")
 
-		posts, _, err := th.SystemAdminClient.GetPostsForChannel(importedChannel.Id, 0, 60, "", false)
+		posts, _, err := th.SystemAdminClient.GetPostsForChannel(importedChannel.Id, 0, 60, "", false, false)
 		require.NoError(t, err)
 		require.Equal(t, posts.Posts[posts.Order[3]].Message, "This is a test post to test the import process", "missing posts in the import process")
 	})