Ext table fixes

[nbeatty-gpa]

Jira Issue(s)

Format example: SC-372

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Description

Fix problems in the test table query results

• choose a column for sorting by default to avoid breaking pagination in SQL
• correct an off-by-one error that clips one row of data from each page
• fix a gemstone bug that would remove a field from local storage every time the table is updated, as long as there is an empty string as the first field.

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How/Where to test OR Detail how it was tested

use an external table test query and verify that screen resizing, sorting, and selecting different pages does not cause unexpected behavior.

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Related PRs

relies on [https://github.com/GridProtectionAlliance/gpa-gemstone/pull/449]

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