Add allow-empty overload field on Process.run

[maurelian]

This PR updates Process.run() to fail by default if the command does not return any output.

This causes failures in any test which uses getContractFunctionAbis, indicating that getContractFunctionAbis has been failing silently due to a zero length array of abis:

optimism/packages/contracts-bedrock/scripts/ForgeArtifacts.sol

Lines 188 to 192 in 921c3ce

	string[] memory contractNames = abi.decode(vm.parseJson(string(Process.run(command))), (string[]));
	abis_ = new Abi[](contractNames.length);
	for (uint256 i; i < contractNames.length; i++) {

This PR is intended to demonstrate this. A fix is also needed to getContractFunctionAbis.

Update: The changes in PR #10739 fix getContractFunctionAbis, so this change can now be applied without breaking existing functionality.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 16.44%. Comparing base (ab663b0) to head (3820162).

Additional details and impacted files

@@             Coverage Diff              @@
##           develop   #10736       +/-   ##
============================================
- Coverage    60.37%   16.44%   -43.93%     
============================================
  Files           19        8       -11     
  Lines         1696      535     -1161     
  Branches        71       71               
============================================
- Hits          1024       88      -936     
+ Misses         640      447      -193     
+ Partials        32        0       -32     

Flag	Coverage Δ
cannon-go-tests	?
chain-mon-tests	27.14% <ø> (ø)
sdk-tests	16.44% <ø> (ø)

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see 11 files with indirect coverage changes