feat: Update embedding tuning sample to use the v1.1.3 pipeline.

[skarukas]

Description

Update embedding tuning sample to use the v1.1.3 pipeline. Also remove some extra [START aiplatform_sdk_embedding_model_tuning] tags that led to incorrect display in docs

BUG=b/340594864

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Checklist

• [x] I have followed Sample Format Guide
• [x] pom.xml parent set to latest shared-configuration
• [ ] Appropriate changes to README are included in PR
• [ ] These samples need a new API enabled in testing projects to pass (let us know which ones)
• [ ] These samples need a new/updated env vars in testing projects set to pass (let us know which ones)
• [x] Tests pass: mvn clean verify -Dtest=EmbeddingModelTuningSampleTest required
• [x] Lint passes: mvn -P lint checkstyle:check required
• [x] Static Analysis: mvn -P lint clean compile pmd:cpd-check spotbugs:check advisory only
• [ ] This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample
• [ ] This sample adds a new Product API, and I updated the Blunderbuss issue/PR auto-assigner with the codeowners for this sample
• [x] Please merge this PR for me once it is approved

[snippet-bot[bot]]

Here is the summary of changes.

You are about to delete 2 region tags.

• aiplatform/src/main/java/aiplatform/EmbeddingModelTuningSample.java:36, tag aiplatform_sdk_embedding_model_tuning
• aiplatform/src/main/java/aiplatform/EmbeddingModelTuningSample.java:67, tag aiplatform_sdk_embedding_model_tuning

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[skarukas]

Looks like this is blocked by unrelated failures in testCreateCustomJobSample and testCreateHyperparameterTuningJobSample:

• http://screen/5i47RA7TXZCvGsA
• http://screen/4mE9tND87QMzvFE