Include Examples Packages in Test Coverage

[darthtrevino]

The previous philosophy of react-dnd has been to apply test coverage to the primary libraries.

By applying test coverage to the examples, we can make this metric reflect the overall testability of the system and understand the testing implications better for clients.

[codecov]

Codecov Report

Merging #3037 (5c1531d) into main (2ba22bf) will decrease coverage by 11.28%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             main    #3037       +/-   ##
===========================================
- Coverage   52.09%   40.81%   -11.29%     
===========================================
  Files          79      253      +174     
  Lines        2290     3788     +1498     
  Branches      500      768      +268     
===========================================
+ Hits         1193     1546      +353     
- Misses       1097     2241     +1144     
- Partials        0        1        +1     

Impacted Files	Coverage Δ
...ples-hooks/src/01-dustbin/multiple-targets/Box.tsx	100.00% <0.00%> (ø)
packages/examples-decorators/src/index.ts	0.00% <0.00%> (ø)
...c/07-regression/drag-source-rerender/Container.tsx	0.00% <0.00%> (ø)
...ples-hooks/src/03-nesting/drop-targets/Dustbin.tsx	0.00% <0.00%> (ø)
...rators/src/01-dustbin/multiple-targets/Dustbin.tsx	78.94% <0.00%> (ø)
...regression/remount-with-correct-props/ItemTypes.ts	0.00% <0.00%> (ø)
...egression/remount-with-correct-props/TargetBox.tsx	0.00% <0.00%> (ø)
...examples-hooks/src/04-sortable/simple/ItemTypes.ts	0.00% <0.00%> (ø)
.../examples-decorators/src/00-chessboard/Overlay.tsx	81.81% <0.00%> (ø)
...decorators/src/06-other/native-files/Container.tsx	0.00% <0.00%> (ø)
... and 164 more