IGNITE-27686 Improve compute error message on marshaller mismatch

[valepakh]

https://issues.apache.org/jira/browse/IGNITE-27686

Separated helper method for argument and result so that the error messages are different.

[Copilot]

Pull request overview

This PR improves error messages for compute marshaller mismatches by separating the generic unmarshalArgOrResult method into two specific public methods: unmarshalArg and unmarshalResult. Each method provides distinct error messages that clearly indicate which API method (ComputeJob.inputMarshaller, JobDescriptor.argumentMarshaller, ComputeJob.resultMarshaller, or JobDescriptor.resultMarshaller) is causing the mismatch. The PR also adds comprehensive test coverage for all four mismatch scenarios and fixes minor spelling issues.

Changes:

• Split unmarshalArgOrResult into context-specific unmarshalArg and unmarshalResult methods with tailored error messages
• Added test cases for argument/result marshallers defined only in descriptor (not just in job)
• Fixed spelling errors ('unmarshaled' → 'unmarshalled', class name typo)

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
modules/client-common/src/main/java/org/apache/ignite/internal/compute/SharedComputeUtils.java	Split unmarshalArgOrResult into unmarshalArg and unmarshalResult with specific error messages for arguments vs results
modules/client-common/src/main/java/org/apache/ignite/internal/client/proto/ClientComputeJobUnpacker.java	Updated to use unmarshalResult instead of unmarshalArgOrResult
modules/client-common/src/test/java/org/apache/ignite/internal/client/proto/ClientComputeJobPackerUnpackerTest.java	Updated test assertions to check for new specific error messages
modules/runner/src/integrationTest/java/org/apache/ignite/internal/runner/app/client/ItThinClientComputeTypeCheckMarshallingTest.java	Enhanced test coverage with 4 new test methods, improved assertions, fixed spelling/naming issues
modules/compute/src/main/java/org/apache/ignite/internal/compute/ResultUnmarshallingJobExecution.java	Updated to use unmarshalResult for result unmarshalling
modules/compute/src/main/java/org/apache/ignite/internal/compute/IgniteComputeImpl.java	Updated to use unmarshalResult for result unmarshalling
modules/compute/src/main/java/org/apache/ignite/internal/compute/ComputeUtils.java	Updated to use unmarshalArg for argument unmarshalling
modules/compute/src/test/java/org/apache/ignite/internal/compute/executor/ComputeExecutorTest.java	Updated test to use unmarshalResult
modules/compute/src/test/java/org/apache/ignite/internal/compute/ComputeComponentImplTest.java	Updated tests to use unmarshalArg/unmarshalResult appropriately
modules/client/src/test/java/org/apache/ignite/client/fakes/FakeCompute.java	Updated to use unmarshalArg for arguments and unmarshalResult for results

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