Update sessions range on dashboard

[scottqueen-bixal]

Background

Because of the inconsistency we are having with hourly metrics for both today and last-48-hours reporting, (see, https://github.com/orgs/18F/projects/55/views/1?filterQuery=assignee%3A%22scottqueen-bixal%22&pane=issue&itemId=50003426) we are going to move over to a 30day session based reporting as a replacement.

See this conversation thread for more detail -> https://gsa-tts.slack.com/archives/C05S1B327MH/p1705421899626399

User Story

As a user visiting https://analytics.usa.gov/, I should see a bar chart displaying "Daily Sessions in the Past 30 Days" by day
As a user visiting https://analytics.usa.gov/, I should see a SUM of the total number for the sessions in the past 30 days

Acceptance Criteria

• id = total_visitors displays a SUM of the total number for the sessions in the past 90 days
• id = total_visitors displays There were <sum> billion sessions over the past 90 days.
• chart with id = time_series is a bar chart displaying "Daily Sessions in the Past 30 Days" by day
• chart with id = time_series displays dd/mm as notation along the X axis
• chart with id = time_series displays a title for "Daily Sessions in the Past 30 Days"
• chart with id = time_series does not display Easter Time

[scottqueen-bixal]

@nick-mon1 I've updated our reports to include sessions-over-30-days.json https://analytics-develop.app.cloud.gov/data/live/sessions-over-30-days.json

[nick-mon1]

@smarina04 Copy updates are ready for review #1103

[scottqueen-bixal]

@nick-mon1 linking this slack comment as it is a decision point for moving forward with this update https://gsa-tts.slack.com/archives/C05S1B327MH/p1705595825206679?thread_ts=1705595482.488289&cid=C05S1B327MH