Increase splay of Puma worker restarts

What does this MR do?

In order to avoid too many simultaneous regular Puma worker restarts, increase the splay from the default of 0-5 minutes to 0-60 minutes.

Related to observations seen in gitlab-com/gl-infra/production#3370 (closed)

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