10202 extend get version files api to include total file count

[stevenwinship]

What this PR does / why we need it:
Extend getVersionFiles API endpoint to include the total file count, which is required for pagination

Which issue(s) this PR closes: #10202

Closes #10202

Special notes for your reviewer:

Suggestions on how to test this: call getVersionFiles. response should have total_count in addition to the status and data fields

Does this PR introduce a user interface change? If mockups are available, please link/include them here: No

Is there a release notes update needed for this change?:

Additional documentation:

[GPortas]

It looks good to me!

I just added a couple of comments related to the code.

I think we should mention the new total count response field in the documentation. See: native-api.rst (List Files in a Dataset). There are some examples of calling the endpoint using pagination params. It might be a good place to mention it.

Please also add a release note describing the change.

[GPortas]

I just realized that Jenkins step is failing, but I can't see the job (network permissions).

[stevenwinship]

I just realized that Jenkins step is failing, but I can't see the job (network permissions).

This was a Jenkins issue that was fixed

[GPortas]

Looks good @stevenwinship, thank you for applying the changes.

I just added minor formatting tweaks to the docs.

[coveralls]

coverage: 20.163% (-0.002%) from 20.165%
when pulling dfb1795 on 10202-extend-getVersionFiles-api-to-include-total-file-count
into 17bfeb9 on develop.

[github-actions]

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