fix: update TestListTsRange to return all range

[nityanandagohain]

Previously we had an if clause that if the startEndArr array is empty don't run the new pagination and fallback, which was missed so. Queries for <= hour interval were returning empty results.

Update the function to return a signle item which contains the actual start and end if the interval is < hour

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[!IMPORTANT] Fixes GetListTsRanges to return a single range for intervals less than 1 hour, updating the test case accordingly.

• Behavior:
  • Fixes GetListTsRanges in logs.go to return a single range for intervals < 1 hour.
  • Previously, intervals <= 1 hour returned empty results.
• Tests:
  • Updates TestListTsRange in logs_test.go to expect a single range for intervals < 1 hour.

^{This description was created by for 2ed2bd617537e2d8d0ff252412afb07683a11c39. It will automatically update as commits are pushed.}

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