Restore behaviour of naming VTC layers after dataset

[dmannarino]

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Pull request type

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• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
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• Documentation content changes
• Other (please describe):

What is the current behavior?

• All vector tile cache layers were being named "data" instead of after the dataset name

Issue Number: GTC-2949

What is the new behavior?

• All vector tile cache layers are named after the dataset name. Possibly not what we want in the end, but this was the previous behavior, which people expect

Does this introduce a breaking change?

• Yes
• No

Other information

• Actually, we weren't specifying the layer name before, tippecanoe was using the dataset name because that's what we named the JSON file after. It looks like we DO allow clients to specify a layer name, but ignore it. But that's another ticket...

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.15%. Comparing base (1fd445a) to head (c567610).

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Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #579   +/-   ##
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  Coverage    81.15%   81.15%           
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  Files          128      128           
  Lines         5820     5820           
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  Hits          4723     4723           
  Misses        1097     1097           

Flag	Coverage Δ
unittests	81.15% <ø> (ø)

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