fix: KV Store Processor TTL Key

[jshlbrd]

Description

• Fixes a bug in the KV Store processor where the ttl_key cannot be used by itself
• Updates the default options for the KV store processor

Motivation and Context

N/A

How Has This Been Tested?

Integration tested with production data pipelines.

Types of changes

• 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 change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.