chore(QTDI-2913): fix wrong condition

[undx]

https://qlik-dev.atlassian.net/browse/QTDI-2913

Requirements

• Any code change adding any logic MUST be tested through a unit test executed with the default build
• Any API addition MUST be done with a documentation update if relevant

Why this PR is needed?

What does this PR adds (design/code thoughts)?

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[Copilot]

Pull request overview

This PR fixes the custom Beam serialization path so top-level String values are serialized with the correct ObjectOutputStream.writeString branch instead of being treated as class descriptors.

Changes:

• Removed the incorrect String.class.isInstance(obj) branch that invoked writeClassDesc.
• Added a regression test covering SerializationWrapper.replace(...) with a top-level String.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
component-runtime-beam/src/main/java/org/talend/sdk/component/runtime/beam/transformer/BeamIOTransformer.java	Corrects serializer branching for String values.
component-runtime-beam/src/test/java/org/talend/sdk/component/runtime/beam/transformer/BeamIOTransformerTest.java	Adds regression coverage for String serialization through SerializationWrapper.

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Quality Gate passed

Issues

• 0 New Issues
• 2 Fixed Issues
• 0 Accepted Issues

Measures

• 0 Security Hotspots
• No data about coverage (0.00% Estimated after merge)
• 0.00% Duplicated Code (1.50% Estimated after merge)

Project ID: org.talend.sdk.component:component-runtime

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