fix(gnovm): correct filetest directive behavior

[ltzmaxwell]

The test result is misleading. Without an output directive set, the current logic does not provide a prompt even when actual output occurs.

package main

func main() {
	println("ok")
}

// Error:
// panic xxx

before fix:

=== RUN TestFiles
=== PAUSE TestFiles
=== CONT TestFiles
=== RUN TestFiles/a111.gno
--- PASS: TestFiles (0.14s)
--- PASS: TestFiles/a111.gno (0.01s)
PASS
ok command-line-arguments 1.619s

after fix:

=== RUN TestFiles
=== PAUSE TestFiles
=== CONT TestFiles
=== RUN TestFiles/a111.gno
files_test.go:92: unexpected output:
ok

--- FAIL: TestFiles (0.13s)
--- FAIL: TestFiles/a111.gno (0.01s)
FAIL
FAIL command-line-arguments 1.479s
FAIL

[Gno2D2]

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Codecov Report

Attention: Patch coverage is 40.00000% with 3 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
gnovm/pkg/test/filetest.go	40.00%	2 Missing and 1 partial ⚠️

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[thehowl]

What if we had instead at the beginning of runFiletest, something like:

	if dirs.First(DirectiveOutput) == nil && dirs.First(DirectiveError) == nil {
		return "", errors.New("all filetests require at least an Output or Error directive")
	}

[ltzmaxwell]

What if we had instead at the beginning of runFiletest, something like:

	if dirs.First(DirectiveOutput) == nil && dirs.First(DirectiveError) == nil {
		return "", errors.New("all filetests require at least an Output or Error directive")
	}

Sometimes it's not necessary to set a directive, all we need is that it's not panicking, e.g.

package main 

var a int 
var b string
...

The key issue is that a proper directive must be provided whenever an Error or Output occurs. This ensures that the system can handle these events appropriately and take the necessary actions.

Thank for the review. @thehowl