[Chore] Put date into test index and collection names

[jhamon]

Problem

Sometimes indexes and collections aren't cleaned up properly after tests run. It's difficult to clean up orphaned resources without potentially impacting resources associated with tests that are currently running.

Solution

Modify generated names to include a timestamp. This will pave the way for automatically deleting orphaned resources after a certain period of time.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update
• Infrastructure change (CI configs, etc)
• Non-code change (docs, etc)
• None of the above: (explain here)

Test Plan

Describe specific steps for validating this change.