email send rate limiting

[djmunoz1]

As an email admin I want to control how many veterans see my first email about login.gov adoption so that it I can conduct a controlled live test and limit risk to VA business intake offices.

ACCEPTANCE CRITERIA:

• Using metrics/numbers from previous research, determine the following:
  • how many veterans have both a DSLogon and Login.gov credential AND most recently logged in with the DSLogon credential
  • how many unique logins are there per day from the previous bullet point's population
  • using the numbers from the previous two bullet points, determine the Flipper percentage setting needed to capture a total of 15,000 eligible veterans
• Configure the reactivation_experiment_rate_limit Flipper feature settings to capture the correct number of veterans (from the last bullet points.

[jrjamespdx]

With the changes made in #60787 and #62244, this should just require a quick change to the reactivation_experiment_rate_limit Flipper feature controls.