[9.1](backport #45205) [AutoOps] Include Missing Total Size

[mergify]

This includes the 'total' data set size in addition to just the size in bytes.

Proposed commit message

Send the missing total_data_set_size_in_bytes alongside the size_in_bytes.

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works
• I have added an entry in CHANGELOG.next.asciidoc or CHANGELOG-developer.next.asciidoc.

Disruptive User Impact

None. Unreleased code.

Author's Checklist

• Node stats should produce size_in_bytes with total_data_set_size_in_bytes

How to test this PR locally

Run the node_stats metricset and verify the total_data_set_size_in_bytes is included in the documents.

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This is an automatic backport of pull request #45205 done by Mergify.

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