Add support for gcp ops agent

[ejseqera]

Add support for installing the Google Cloud Ops Agent on Google Batch instances through a new configuration option google.batch.installOpsAgent. OpsAgent on GCP helps provide telemetry and monitoring info on VM instances like CPU, memory, disk I/O metrics.

Changes

• Add installOpsAgent config option to BatchConfig
• Update GoogleBatchTaskHandler to include installOpsAgent in the allocation policy API request
• Add test coverage for the new configuration option
• Update documentation with usage notes and compatibility requirements

Test with:

process {
    executor = 'google-batch'
}

google {
    project = 'google-project'  // Replace with proj
    location = '<your_region>' // Replace with region

    batch {
        bootDiskImage = 'projects/batch-custom-image/global/images/family/batch-debian-11-official' // compatible OS image
        installOpsAgent = true
        spot = true
    }
}

nextflow run nextflow-io/hello -c batch.config

Resultant jobs will use batch-debian as the OS and the Batch job logs will show installation of the OpsAgent.

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[matthdsm]

Watching this PR, we need this

[bentsherman]

@ejseqera can you or someone else address the comments? Otherwise we will close it rather than leave it sitting around

[ejseqera]

@bentsherman I've addressed the comments above, this should be ready to merge now.