Revert "Add DiskProvisionedIops/ThroughputMibps options and update Go…

[damccorm]

… client libraries (#37377)"

This reverts commit 7910b1b.

Context: #37377 (comment)

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[damccorm]

R: @jrmccluskey

cc/ @bambadiouf1 (if you put up a PR adding back the Java/Go pieces I can quickly approve)

[gemini-code-assist]

Summary of Changes

Hello, 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 performs a complete reversion of a previous commit that introduced new disk provisioning options for Dataflow runners in the Java, Python, and Go SDKs. This action removes the associated code, configuration, and dependency updates that were part of the original feature, effectively rolling back the system to its state before the introduction of these specific disk customization capabilities.

Highlights

• Reverted Dataflow Disk Provisioning Options: The pull request fully reverts the addition of DiskProvisionedIops and DiskProvisionedThroughputMibps options across Java, Python, and Go Dataflow SDKs.
• Go Client Library Downgrade: Several Go client libraries and related dependencies were reverted to their previous versions, undoing recent updates.
• Java Dataflow API Version Reversion: The google_api_services_dataflow version in the Gradle build configuration was reverted to an older revision.
• Removed Changelog Entry: The entry in CHANGES.md documenting the addition of disk provisioned IOPS and throughput support was removed.

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[gemini-code-assist]

Code Review

This pull request removes support for configuring disk provisioned IOPS and throughput across the Java, Go, and Python SDKs, including the removal of associated pipeline options, translator logic, and tests. Additionally, it downgrades several Google Cloud and OpenTelemetry dependencies in the Go SDK and updates the autogenerated Dataflow API client in Python. A potential issue was identified in the Go runner where the removal of a nil check for pipeline options could result in a runtime panic.

[gemini-code-assist]

Removing the nil check for opts.Options.Options introduces a potential panic if the map is not initialized. Even if current callers ensure initialization, keeping this check makes the Translate function more robust against future changes or external calls.

	if opts.Options.Options == nil {
		opts.Options.Options = make(map[string]string)
	}
	opts.Options.Options["experiments"] = strings.Join(opts.Experiments, ",")

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