Added flag for overriding artifact hostname

[BCantos17]

Addresses #19878

Added flag for overriding artifact hostname

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[gemini-code-assist]

Summary of Changes

Hello @BCantos17, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the JobServerDriver by introducing a dedicated configuration option for the artifact service's hostname. This change provides greater flexibility in deploying Apache Beam job servers, particularly in environments where the artifact staging service might reside on a different host or require a specific hostname override, thereby addressing a known issue related to artifact service endpoint configuration.

Highlights

• New Configuration Option: Introduced a new command-line option, --artifact-host, for the JobServerDriver to explicitly specify the hostname for the artifact service.
• Artifact Service URL Construction: Modified the artifact staging service to use the newly provided artifactHost configuration when constructing its URL, allowing it to be distinct from the main job service host.

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[github-actions]

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R: @robertwb added as fallback since no labels match configuration

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[github-actions]

Reminder, please take a look at this pr: @robertwb