fix issue in the new RC unit tests

[rathovarun1032]

fix(rc): Throw IllegalArgumentException for invalid template JSON

The ServerTemplateImpl constructor was catching template parsing
exceptions and only printing the stack trace to stderr. This resulted
in noisy console output during unit tests, even when the tests passed.

This change updates the constructor to throw an IllegalArgumentException
when a provided cachedTemplate fails to parse.

Updated testEvaluateWithInvalidCacheValueThrowsException to assert
this new behavior.

[gemini-code-assist]

Code Review

This pull request updates the ServerTemplateImpl constructor to throw an IllegalArgumentException when JSON parsing fails, replacing a simple stack trace print. Correspondingly, the unit tests have been updated to verify that this exception is thrown during the template building phase and that it contains the correct cause and message. I have no feedback to provide.