Fix secret generation for mutual ssl config

[anuruddhal]

• Fix secret generation for mutual ssl config
• Resolves Getting null pointer exception when building code with configurable variables #767

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

❗ No coverage uploaded for pull request base (2201.8.x@aa7166c). Click here to learn what that means.

Files	Patch %	Lines
...n/java/io/ballerina/c2c/tasks/C2CAnalysisTask.java	20.00%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             2201.8.x     #768   +/-   ##
===========================================
  Coverage            ?   82.27%           
  Complexity          ?      397           
===========================================
  Files               ?       47           
  Lines               ?     2183           
  Branches            ?      272           
===========================================
  Hits                ?     1796           
  Misses              ?      257           
  Partials            ?      130           

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