Harden operations_dashboard_default_dashboard usage query

What does this MR do?

Harden operations_dashboard_default_dashboard usage data query by using precomputed user min/max id range

Query MIN

SELECT MIN("users"."id") FROM "users" WHERE ("users"."state" IN ('active')) AND ("users"."user_type" IS NULL OR "users"."user_type" IN (NULL, 6, 4)) AND "users"."dashboard" = 8 AND "users"."created_at" BETWEEN '2020-05-08 11:17:49.312323' AND '2020-06-05 11:17:49.312513'

Before: https://explain.depesz.com/s/LBDPU 406 seconds

After: precomputed value

Query MAX

SELECT MAX("users"."id") FROM "users" WHERE ("users"."state" IN ('active')) AND ("users"."user_type" IS NULL OR "users"."user_type" IN (NULL, 6, 4)) AND "users"."dashboard" = 8 AND "users"."created_at" BETWEEN '2020-05-08 11:17:49.312323' AND '2020-06-05 11:17:49.312513'

Before: https://explain.depesz.com/s/9qYN

After: precomputed value

Query Count

SELECT COUNT("users"."id") FROM "users" WHERE ("users"."state" IN ('active')) AND ("users"."user_type" IS NULL OR "users"."user_type" IN (NULL, 6, 4)) AND "users"."dashboard" = 8 AND "users"."created_at" BETWEEN '2020-05-08 11:17:49.312323' AND '2020-06-05 11:17:49.312513' AND "users"."id" BETWEEN 0 AND 9999

Before: https://explain.depesz.com/s/31Cx 337 milliseconds for a batch of 10K which is fine

Timing less than 5 seconds on gitlab.com

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers
• Informed Infrastructure department of a default or new setting change, if applicable per definition of done

Security

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

Closes #220479 (closed)