Feature/fix temporal subsetting ghrsst

[sliu008]

Description

• Sometime when accessing sst_dtime variable in some collection we get an exception _scale_offset_decoding\r\n data *= scale_factor\r\nnumpy.core._exceptions._UFuncOutputCastingError: Cannot cast ufunc 'multiply' output from dtype('float64') to dtype('int64') with casting rule 'same_kind'\r\n`. Track down the problem when we set the mask_and_scale to true when opening the file.

Overview of work done

• Add a new function to test the ability to use access the sst_dtime variable to determine if we should use mask_and_scale

Overview of verification done

• Tested temporal subsetting locally

Overview of integration done

Explain how this change was integration tested. Provide screenshots or logs if appropriate. An example of this would be a local Harmony deployment.

PR checklist:

• Linted
• Updated unit tests
• Updated changelog
• Integration testing

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[frankinspace]

Can you also add changelog entry