Renamed destroy stream to ngUnsubscribe

[Blackbaud-SteveBrush]

See: https://stackoverflow.com/questions/38008334/angular-rxjs-when-should-i-unsubscribe-from-subscription#answer-41177163

[codecov-io]

Codecov Report

Merging #1527 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff           @@
##           master   #1527   +/-   ##
======================================
  Coverage     100%    100%           
======================================
  Files         390     390           
  Lines        7787    7787           
  Branches     1142    1142           
======================================
  Hits         7787    7787

Impacted Files	Coverage Δ
src/modules/dropdown/dropdown-menu.component.ts	100% <100%> (ø)	⬆️
...modules/list-view-grid/list-view-grid.component.ts	100% <100%> (ø)	⬆️
src/modules/autocomplete/autocomplete.component.ts	100% <100%> (ø)	⬆️
...dules/autocomplete/autocomplete-input.directive.ts	100% <100%> (ø)	⬆️
src/modules/flyout/flyout.component.ts	100% <100%> (ø)	⬆️
src/modules/dropdown/dropdown.component.ts	100% <100%> (ø)	⬆️

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