[ECF GCP] Add documentation for tech preview · elastic/opentelemetry@a01182d

Run Vale Linter: docs/reference/edot-cloud-forwarder/gcp.md#L178

Elastic.Acronyms: 'GCS' has no definition.

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Elastic.Acronyms: 'GCS' has no definition.

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Elastic.Acronyms: 'VPC' has no definition.

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Elastic.Acronyms: 'GCS' has no definition.

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Elastic.Ellipses: In general, don't use an ellipsis.

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Elastic.Acronyms: 'IAM' has no definition.

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Elastic.Acronyms: 'IAM' has no definition.

Run Vale Linter: docs/reference/edot-cloud-forwarder/gcp.md#L42

Elastic.Acronyms: 'VPC' has no definition.

Run Vale Linter: docs/reference/edot-cloud-forwarder/gcp.md#L33

Elastic.Acronyms: 'GCS' has no definition.

Run Vale Linter: docs/reference/edot-cloud-forwarder/gcp.md#L30

Elastic.Acronyms: 'GCS' has no definition.

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