Number of execution counter in AWS qubit device fixed

[drelu]

*Issue #, if available: None

*Description of changes: Increment counter for num_executions for single and batch executions so that BraketQubitDevice behaves consistent with Pennylane specification in base class: https://docs.pennylane.ai/en/stable/code/api/pennylane.Device.html#pennylane.Device.num_executions

*Testing done: Unit test provided

Merge Checklist

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[codecov]

Codecov Report

Merging #114 (61dd745) into main (a3635d6) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main      #114   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            5         5           
  Lines          654       656    +2     
  Branches        92        92           
=========================================
+ Hits           654       656    +2     

Impacted Files	Coverage Δ
src/braket/pennylane_plugin/braket_device.py	100.00% <100.00%> (ø)

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