fix(compute): remove duplicate region_tag dependencies

[Kef131]

Description

Fixes #
b/527028564

• Removed duplicate region tag dependencies in compute/mailjet/pom.xml, region tag is not used and not references on https://docs.cloud.google.com/compute/docs/tutorials/sending-mail/using-mailjet?hl=en

Checklist

• I have followed Sample Format Guide
• pom.xml parent set to latest shared-configuration (uses standard 1.2.0)
• 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)
• Tests pass: mvn clean verify required
• Lint passes: mvn -P lint checkstyle:check required
• Static Analysis: mvn -P lint clean compile pmd:cpd-check spotbugs:check advisory only (Static analysis fails on local JDK 25 due to spotbugs/error-prone incompatibilities, but standard compilation and verify pass successfully)
• 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
• Please merge this PR for me once it is approved

[gemini-code-assist]

Code Review

This pull request removes the [START dependencies] and [END dependencies] comment tags around the Mailjet client dependency in the pom.xml file. There are no review comments, and I have no feedback to provide.

[amcolin]

LGTM!

[angelcaamal]

LGTM

[XrossFox]

LGTM

[snippet-bot]

Here is the summary of changes.

You are about to delete 1 region tag.

• compute/mailjet/pom.xml:59, tag dependencies

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