Fix ruleset filtering to only include rulesets with tools.enabled=true

[lgrateau]

Issue Description

Currently, the extract_highest_version_rulesets method in DecisionServerManager.py is only checking for the existence of the tools.enabled property, but not verifying that its value is specifically set to "true".

Current Behavior

Rulesets are included if they have the tools.enabled property, regardless of its value.

Expected Behavior

Only rulesets with tools.enabled set to "true" (case-insensitive) should be included.

Solution

Update the filter condition in extract_highest_version_rulesets to check that tools.enabled equals "true" (case-insensitive).

Additional Context

This fix ensures proper filtering of decision services that should be exposed as tools.