[AWS Fargate] Remove sum of counters in dashboard

[constanca-m]

What does this PR do?

Update DiskIO Write and Read visualizations to use last_value instead of average.

This is necessary because awsfargate.task_stats.diskio.read.bytes and awsfargate.task_stats.diskio.write.bytes, the metrics used for these visualizations, are counters. This means that the only 2 aggregations supported for them are max and last_value.

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.
• I have added an entry to my package's changelog.yml file.
• I have verified that Kibana version constraints are current according to guidelines.

Related issues

Relates to #6732.

Screenshots

Current visualizations with this change:

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• Start Time: 2023-07-18T13:31:33.222+0000

• Duration: 14 min 16 sec

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[kaiyan-sheng]

The change looks good to me. Could you update the screenshot in https://github.com/elastic/integrations/tree/main/packages/aws/img for fargate with the new visualizations?

[constanca-m]

The screenshot has the new visualization @kaiyan-sheng The result is the same as the old visualization :)

[kaiyan-sheng]

Perfect! Thanks!

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Package awsfargate - 0.2.5 containing this change is available at https://epr.elastic.co/search?package=awsfargate