Update dim_user_levels to include content_area and topic_tags

[nataliazm99]

There's two changes in this PR:

1. Adding content_area and topic_tags to dim_user_levels
2. Change to staging scripts layer to define content_area as 'other' when null to make it consistent with the logic we use for course_names where nulls are defined as 'other'

Jira ticket(s): DATAOPS-1082

[nataliazm99]

QA'd by

1. Comparing test schema vs prod for:
   a. dim_active_students --> No difference
   b. dim_user_course_activity --> difference of 1 csf student in 2022-23

2. Validating that user counts for combinations of course, content area, and topic tags make sense.

Code used for QA:

1.a

with 
test as (
select 
school_year
, is_active_student
, has_user_level_activity
, count(distinct student_id) n_students
from dev.dbt_natalia.dim_active_students s
group by 1,2,3
)
--
, prod as (
select 
school_year
, is_active_student
, has_user_level_activity
, count(distinct student_id) n_students
from dev.analytics.dim_active_students s
group by 1,2,3
)
--
select 
  p.school_year
, p.is_active_student
, p.has_user_level_activity
, p.n_students
, t.n_students
from prod p
left join  test t 
on p.school_year = t.school_year
and p.is_active_student = t.is_active_student
and p.has_user_level_activity = t.has_user_level_activity
where p.n_students <> t.n_students
order by 1,2,3
;

1.b.

with 
test as (
select 
 school_year
, course_name
, user_type
, count(distinct user_id) n_users
from 
dev.dbt_natalia.dim_user_course_activity
group by 1,2,3
)
--
, prod as (
select 
 school_year
, course_name
, user_type
, count(distinct user_id) n_users
from 
dev.analytics.dim_user_course_activity
group by 1,2,3
)
--
select  
  p.school_year
, p.course_name
, p.user_type
, p.n_users
, t.n_users
, (p.n_users - t.n_users) diff_n_users
from prod p
left join test t 
on p.school_year = t.school_year
and p.course_name = t.course_name
and p.user_type = t.user_type
where p.n_users <> t.n_users
order by 1,2,3
;

select
school_year
, content_area
, course_name 
, topic_tags
--, script_name
, count(distinct user_id) n_users
from dev.dbt_natalia.dim_user_levels
group by 1,2,3,4--,5
order by 1,2,3,4--,5
;

[allison-code-dot-org]

probably a @jordan-springer question, but any difference between this statement and when content_area = ''?

[allison-code-dot-org]

LGTM! The CI run was successful, and then I updated the branch, kicking off another CI run. Approving now assuming that is also successful.

[nataliazm99]

@jordan-springer ready for you to review

[jordan-springer]

LGTM