[Insights] Change the default weeks period limit to 12

Merged Rémy Coutable requested to merge change-defaults-insights-period into master

What does this MR do?

As discussed, change the default period limit for weeks to 12 instead of 4.

Does this MR meet the acceptance criteria?


Performance and testing


If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

  • Label as security and @ mention @gitlab-com/gl-security/appsec
  • The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
  • Security reports checked/validated by a reviewer from the AppSec team