fix(sdk): fix website source_hash (#3807)

Fixing the source_hash in the sdk snapshots to be a string and not a path

## Checklist

- [x] Title matches [Winglang's style guide](https://www.winglang.io/contributing/start-here/pull_requests#how-are-pull-request-titles-formatted)
- [x] Description explains motivation and solution
- [ ] Tests added (always)
- [ ] Docs updated (only required for features)
- [ ] Added `pr/e2e-full` label if this feature requires end-to-end testing

*By submitting this pull request, I confirm that my contribution is made under the terms of the [Wing Cloud Contribution License](https://github.com/winglang/wing/blob/main/CONTRIBUTION_LICENSE.md)*.

libs/wingsdk/test/target-tf-aws/__snapshots__/website.test.ts.snap

@@ -144,7 +144,7 @@ exports[`default website behavior 1`] = `
         ],
         \\"key\\": \\"/b.html\\",
         \\"source\\": \\"<source>\\",
-        \\"source_hash\\": \\"\${filemd5(\\\\\\"/home/runner/work/wing/wing/libs/wingsdk/test/target-tf-aws/website/b.html\\\\\\")}\\"
+        \\"source_hash\\": \\"\${filemd5(<source>)}\\"
       },
       \\"Website_File--inner-folder--ahtml_7D20A7EF\\": {
         \\"bucket\\": \\"\${aws_s3_bucket.Website_WebsiteBucket_3C0321F0.bucket}\\",
@@ -154,7 +154,7 @@ exports[`default website behavior 1`] = `
         ],
         \\"key\\": \\"/inner-folder/a.html\\",
         \\"source\\": \\"<source>\\",
-        \\"source_hash\\": \\"\${filemd5(\\\\\\"/home/runner/work/wing/wing/libs/wingsdk/test/target-tf-aws/website/inner-folder/a.html\\\\\\")}\\"
+        \\"source_hash\\": \\"\${filemd5(<source>)}\\"
       }
     }
   }
@@ -480,7 +480,7 @@ exports[`website with add_json 1`] = `
         ],
         \\"key\\": \\"/b.html\\",
         \\"source\\": \\"<source>\\",
-        \\"source_hash\\": \\"\${filemd5(\\\\\\"/home/runner/work/wing/wing/libs/wingsdk/test/target-tf-aws/website/b.html\\\\\\")}\\"
+        \\"source_hash\\": \\"\${filemd5(<source>)}\\"
       },
       \\"Website_File--inner-folder--ahtml_7D20A7EF\\": {
         \\"bucket\\": \\"\${aws_s3_bucket.Website_WebsiteBucket_3C0321F0.bucket}\\",
@@ -490,7 +490,7 @@ exports[`website with add_json 1`] = `
         ],
         \\"key\\": \\"/inner-folder/a.html\\",
         \\"source\\": \\"<source>\\",
-        \\"source_hash\\": \\"\${filemd5(\\\\\\"/home/runner/work/wing/wing/libs/wingsdk/test/target-tf-aws/website/inner-folder/a.html\\\\\\")}\\"
+        \\"source_hash\\": \\"\${filemd5(<source>)}\\"
       },
       \\"Website_File-configjson_1F1498B9\\": {
         \\"bucket\\": \\"\${aws_s3_bucket.Website_WebsiteBucket_3C0321F0.bucket}\\",

libs/wingsdk/test/util.ts

@@ -107,6 +107,13 @@ export function tfSanitize(templateStr: string): string {
       ) {
         return "<source>";
       }
+      if (
+        key === "source_hash" &&
+        typeof value === "string" &&
+        value.startsWith("${filemd5")
+      ) {
+        return "${filemd5(<source>)}";
+      }
       return value;
     },
     2