Fall back to FileVersion when an EXE installer has FileVersion but not ProductVersion (#25070)

For #23541

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- [x] Changes file added for user-visible changes in `changes/`,
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changes/23541-fileversion-fallback

@@ -0,0 +1 @@
+* Added fallback to FileVersion on EXE installers when FileVersion is set but ProductVersion isn't to allow more custom packages to be uploaded

pkg/file/pe.go

@@ -72,6 +72,8 @@ func ExtractPEMetadata(tfr *fleet.TempFileReader) (*InstallerMetadata, error) {
 		}
 		if productVersion != "" {
 			version = productVersion
+		} else if strings.TrimSpace(e["FileVersion"]) != "" {
+			version = strings.TrimSpace(e["FileVersion"])
 		}
 	}
 	if name == "" && sfxName != "" {