Fix images in 'Authenticate' panel (#3980)

Image was available in the sandbox, but were not getting bundled into the final artifact

Author: rli

.changes/next-release/bugfix-23fbe63d-b872-48ab-b311-339c4785b471.json

@@ -0,0 +1,4 @@
+{
+  "type" : "bugfix",
+  "description" : "Fix issue where images in 'Authenticate' panel do not show up"
+}

jetbrains-core/build.gradle.kts

@@ -96,16 +96,11 @@ artifacts {
     add("gatewayArtifacts", gatewayJar)
 }
 
-val codewhispererReadmeAssets = tasks.register<Sync>("codewhispererReadmeAssets") {
-    from("${project.projectDir}/assets")
-    into("$buildDir/assets")
-}
-
 tasks.prepareSandbox {
-    dependsOn(codewhispererReadmeAssets)
-    from(codewhispererReadmeAssets) {
-        into("aws-toolkit-jetbrains/assets")
-    }
+    // you probably do not want to modify this.
+    // this affects the IDE sandbox / build for `:jetbrains-core`, but will not propogate to the build generated by `:intellij`
+    // (which is what is ultimately published to the marketplace)
+    // without additional effort
 }
 
 tasks.testJar {

jetbrains-core/assets/codecatalyst.png renamed to jetbrains-core/resources/gettingstarted/codecatalyst.png

@@ -314,7 +314,7 @@ class GettingStartedPanel(
                                 }
                         }
 
-                        image(AwsToolkit.pluginPath().resolve("assets").resolve("codecatalyst.png").toString())
+                        image("/gettingstarted/codecatalyst.png")
 
                         row {
                             text(message("caws.getstarted.panel.description"))
@@ -533,7 +533,7 @@ class GettingStartedPanel(
                                 }
                         }
 
-                        image(AwsToolkit.pluginPath().resolve("assets").resolve("explorer.png").toString())
+                        image("/gettingstarted/explorer.png")
 
                         row {
                             text(message("aws.getstarted.resource.panel_description"))
@@ -741,7 +741,7 @@ class GettingStartedPanel(
                                 }
                         }
 
-                        image(AwsToolkit.pluginPath().resolve("assets").resolve("codewhisperer.png").toString())
+                        image("/gettingstarted/codewhisperer.png")
 
                         row {
                             text(message("codewhisperer.gettingstarted.panel.comment"))
@@ -1050,7 +1050,8 @@ class GettingStartedPanel(
 
         protected fun Panel.image(path: String) {
             row {
-                val image = ImageIcon(path).image
+                // `this` is a [Row], so class needs to be specified or we get the wrong classloader
+                val image = ImageIcon(GettingStartedPanel::class.java.getResource(path)).image
                     // need to account for margin introduced by indent
                     // Image.SCALE_DEFAULT is the only valid parameter for gifs
                     .getScaledInstance(PANEL_WIDTH - (indentSize * 2), -1, if (path.endsWith("gif")) Image.SCALE_DEFAULT else Image.SCALE_SMOOTH)