Use aquery results to determine if a file should be executable

Now that aquery includes this information.

Also added rm -f $out to some rules, because since they write files
by shell redirection, if the file existed before and was executable,
they wouldn't make the file non-executable and visa versa.

Fixes: 297366783
Test: m bazel_sandwich
Change-Id: Ie5b6c4275b162601f51deaec9912eea4be16988d
diff --git a/bazel/aquery.go b/bazel/aquery.go
index d77d59a..76cd972 100644
--- a/bazel/aquery.go
+++ b/bazel/aquery.go
@@ -123,6 +123,7 @@
 	// Unlike most properties in BuildStatement, these paths must be relative to the root of
 	// the whole out/ folder, instead of relative to ctx.Config().BazelContext.OutputBase()
 	ImplicitDeps []string
+	IsExecutable bool
 }
 
 // A helper type for aquery processing which facilitates retrieval of path IDs from their
@@ -560,6 +561,7 @@
 		Mnemonic:          actionEntry.Mnemonic,
 		InputDepsetHashes: depsetHashes,
 		FileContents:      actionEntry.FileContents,
+		IsExecutable:      actionEntry.IsExecutable,
 	}, nil
 }