Delete AWS integration when the resource_signalfx_aws_integration is destroyed

[bgola-signalfx]

Fixes !388

[github-actions]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.87%. Comparing base (2e65364) to head (b53c5f8).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #566   +/-   ##
=======================================
  Coverage   94.87%   94.87%           
=======================================
  Files          35       35           
  Lines        2109     2109           
=======================================
  Hits         2001     2001           
  Misses         89       89           
  Partials       19       19           

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[bgola-signalfx]

I have read the CLA Document and I hereby sign the CLA