[#noissue] Remove unused method from ActiveAgentValidator

[emeroad]

This pull request simplifies the ActiveAgentValidator interface and its implementation by removing an unused method that checked agent activity across multiple time ranges. This reduces code complexity and potential maintenance overhead.

Removed unused multi-range agent validation:

• ActiveAgentValidator interface: Removed the isActiveAgent(Application agent, String version, List<Range> ranges) method declaration.
• DefaultActiveAgentValidator implementation: Removed the corresponding isActiveAgent(Application agent, String version, List<Range> ranges) method implementation.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 33.10%. Comparing base (ba3d66e) to head (ccb5407).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master   #13417   +/-   ##
=========================================
  Coverage     33.10%   33.10%           
  Complexity    10974    10974           
=========================================
  Files          4066     4066           
  Lines         94355    94350    -5     
  Branches       9816     9815    -1     
=========================================
+ Hits          31233    31237    +4     
+ Misses        60440    60430   -10     
- Partials       2682     2683    +1     

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