fix: disable_cypher_qc and other 3+ segment JSON keys

[superlinkx]

Description

Fixes a bug that caused config keys with more than one underscore to not be parsed.

Regression tests have been added to avoid further issues

Motivation and Context

The previous env var fixes introduced a bug when attempting to find the end of a key when the key contains multiple underscores

How Has This Been Tested?

Additional tests have been added and various configurations with varying numbers of underscores and path segments were reviewed to ensure we have coverage for variations of path sizes and variations of multiple underscores per key.

Types of changes

• Chore (a change that does not modify the application functionality)
• 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:

• Documentation updates are needed, and have been made accordingly.
• I have added and/or updated tests to cover my changes.
• All new and existing tests passed.
• My changes include a database migration.