Fix additional file scanning issue that increases the server startup time

[thisaltennakoon]

Fix wso2/api-manager#3452

Current Behavior: The server startup time has increased due to unnecessary file scanning performed by Tomcat. This is caused by invalid characters in the CARBON_CLASSPATH.

• For example, in Linux, a ':' appears at the beginning of the classpath.
• In Windows, multiple occurrences of ';;' are present within the classpath.

Fix: This PR resolves the issue by properly processing the CARBON_CLASSPATH to remove invalid characters, optimizing the server startup time.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 18.96%. Comparing base (b7456cf) to head (a2aa1d8).
Report is 18 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #13636      +/-   ##
============================================
+ Coverage     18.44%   18.96%   +0.51%     
- Complexity      944      976      +32     
============================================
  Files           261      261              
  Lines         12045    12082      +37     
  Branches       1262     1265       +3     
============================================
+ Hits           2222     2291      +69     
+ Misses         9806     9772      -34     
- Partials         17       19       +2     

Flag	Coverage Δ
integration_tests	18.96% <ø> (+0.51%)	⬆️

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