Handle NoSuchKeyException in WorkspaceService and improve error handling

- Updated `WorkspaceServiceImpl` to catch `NoSuchKeyException` and throw `CsmResourceNotFoundException` with a customized error message.
- Modified related exception handler to return detailed NOT_FOUND response.
- Updated integration tests to validate new exception handling and error messages.

Author: jreynard-code

common/src/main/kotlin/com/cosmotech/common/exceptions/CsmExceptionHandling.kt

@@ -163,13 +163,11 @@ open class CsmExceptionHandling : ResponseEntityExceptionHandler() {
   }
 
   @ExceptionHandler(NoSuchKeyException::class)
-  fun handleNoSuchKeyException(exception: NoSuchKeyException): ProblemDetail {
+  fun handleNoSuchKeyException(): ProblemDetail {
     val response = ProblemDetail.forStatus(HttpStatus.NOT_FOUND)
     val notImplementedErrorStatus = HttpStatus.NOT_FOUND
     response.type = URI.create(httpStatusCodeTypePrefix + notImplementedErrorStatus.value())
-    if (exception.awsErrorDetails().errorMessage() != null) {
-      response.detail = exception.awsErrorDetails().errorMessage()
-    }
+    response.detail = "The specified file name does not exist."
     return response
   }
 }

workspace/src/integrationTest/kotlin/com/cosmotech/workspace/service/WorkspaceServiceIntegrationTest.kt

@@ -222,21 +222,21 @@ class WorkspaceServiceIntegrationTest : CsmTestBase() {
     logger.info("should delete a workspace file")
     val resourceTestFile = resourceLoader.getResource("classpath:/$fileName").file
     val input = FileInputStream(resourceTestFile)
+    val originalFilename = resourceTestFile.getName()
     val multipartFile =
-        MockMultipartFile(
-            "file", resourceTestFile.getName(), "text/plain", IOUtils.toByteArray(input))
+        MockMultipartFile("file", originalFilename, "text/plain", IOUtils.toByteArray(input))
 
     workspaceApiService.createWorkspaceFile(
         organizationSaved.id, workspaceSaved.id, multipartFile, true, null)
 
     workspaceApiService.deleteWorkspaceFile(organizationSaved.id, workspaceSaved.id, fileName)
 
     val exception =
-        assertThrows<NoSuchKeyException> {
+        assertThrows<CsmResourceNotFoundException> {
           workspaceApiService.getWorkspaceFile(organizationSaved.id, workspaceSaved.id, fileName)
         }
 
-    assertEquals("The specified key does not exist.", exception.awsErrorDetails().errorMessage())
+    assertEquals("$originalFilename does not exist.", exception.message)
   }
 
   @Test

workspace/src/main/kotlin/com/cosmotech/workspace/service/WorkspaceServiceImpl.kt

@@ -56,6 +56,7 @@ import org.springframework.web.multipart.MultipartFile
 import software.amazon.awssdk.awscore.exception.AwsServiceException
 import software.amazon.awssdk.services.s3.S3Client
 import software.amazon.awssdk.services.s3.model.ListObjectsV2Request
+import software.amazon.awssdk.services.s3.model.NoSuchKeyException
 
 private const val WORKSPACE_FILES_BASE_FOLDER = "workspace-files"
 
@@ -233,12 +234,20 @@ internal class WorkspaceServiceImpl(
         workspace.id,
         workspace.name,
         fileName)
-    return InputStreamResource(
-        s3Template
-            .download(
-                csmPlatformProperties.s3.bucketName,
-                "$organizationId/$workspaceId/$WORKSPACE_FILES_BASE_FOLDER/$fileName")
-            .inputStream)
+    var fileResource: Resource
+    try {
+      fileResource =
+          InputStreamResource(
+              s3Template
+                  .download(
+                      csmPlatformProperties.s3.bucketName,
+                      "$organizationId/$workspaceId/$WORKSPACE_FILES_BASE_FOLDER/$fileName")
+                  .inputStream)
+    } catch (exception: NoSuchKeyException) {
+      throw CsmResourceNotFoundException("$fileName does not exist.", exception)
+    }
+
+    return fileResource
   }
 
   override fun createWorkspaceFile(