Add custom users to the htpasswd file for caregiver beta

Description

What details are necessary for understanding the specific work or request tracked by this issue? @kevinmirc has requested we add three users to the htpasswd file in dev/staging/prod. The usernames are: caregiverbeta001, caregiverbeta002, caregiverbeta003 The passwords for each should be unique in each environment, and randomly generated.

Background/context/resources

Any additional context for the reader to know, if applicable https://github.com/department-of-veterans-affairs/devops/pull/7422 https://dsva.slack.com/archives/CBU0KDSB1/p1597680499074300

Technical notes

Notes around work that is happening, if applicable htpasswd file is in credstash: revproxy..htpasswd_basic_auth We will need to retain the veterans user that is there, and add these three user/password combinations to each This will be needed temporarily. Passwords should be communicated to @kevinmirc via secure channel when they are created A new ticket should be created to remove these user/passwords from the htpasswd after 30 days or whenever @kevinmirc is done with them.

Tasks

[x] Create htpasswd format user:pass combinations for three users in each environment
[x] Add these user/pass combinations to the existing credstash entry
[x] Deploy the configuration changes to dev/staging
[x] Test basic auth
[x] Deploy to Prod
[x] Test basic auth in Prod
[x] Create ticket to remove the passwords in 30 days

Definition of Done

[x] Basic auth is enabled on the required page in dev/staging/prod

Reminders

[x] Please attach your team label and any other appropriate label(s)
[x] Please attach the needs grooming tag if needed
[ ] Please connect to an epic

department-of-veterans-affairs / va.gov-team