[chore] add back exif-terminator and use only for jpeg,png,webp (#3161)

* add back exif-terminator and use only for jpeg,png,webp

* fix arguments passed to terminateExif()

* pull in latest exif-terminator

* fix test

* update processed img

---------

Co-authored-by: tobi <tobi.smethurst@protonmail.com>

vendor/github.com/superseriousbusiness/go-png-image-structure/v2/testing_common.go

@@ -0,0 +1,77 @@
+package pngstructure
+
+import (
+	"fmt"
+	"os"
+	"path"
+)
+
+var (
+	assetsPath = "assets"
+)
+
+func getModuleRootPath() (string, error) {
+	moduleRootPath := os.Getenv("PNG_MODULE_ROOT_PATH")
+	if moduleRootPath != "" {
+		return moduleRootPath, nil
+	}
+
+	currentWd, err := os.Getwd()
+	if err != nil {
+		return "", err
+	}
+
+	currentPath := currentWd
+	visited := make([]string, 0)
+
+	for {
+		tryStampFilepath := path.Join(currentPath, ".MODULE_ROOT")
+
+		_, err := os.Stat(tryStampFilepath)
+		if err != nil && !os.IsNotExist(err) {
+			return "", err
+		} else if err == nil {
+			break
+		}
+
+		visited = append(visited, tryStampFilepath)
+
+		currentPath = path.Dir(currentPath)
+		if currentPath == "/" {
+			return "", fmt.Errorf("could not find module-root: %v", visited)
+		}
+	}
+
+	return currentPath, nil
+}
+
+func getTestAssetsPath() (string, error) {
+	if assetsPath == "" {
+		moduleRootPath, err := getModuleRootPath()
+		if err != nil {
+			return "", err
+		}
+
+		assetsPath = path.Join(moduleRootPath, "assets")
+	}
+
+	return assetsPath, nil
+}
+
+func getTestBasicImageFilepath() (string, error) {
+	assetsPath, err := getTestAssetsPath()
+	if err != nil {
+		return "", err
+	}
+
+	return path.Join(assetsPath, "libpng.png"), nil
+}
+
+func getTestExifImageFilepath() (string, error) {
+	assetsPath, err := getTestAssetsPath()
+	if err != nil {
+		return "", err
+	}
+
+	return path.Join(assetsPath, "exif.png"), nil
+}