build: add tsconfig config in e2e folder

This is picked up by the TS language server which improves DX when writing and debugging tests. Previously, the default TS options were used which results in discrepancies such as strict mode is not enabled.

Author: alan-agius4

tests/legacy-cli/tsconfig.json

@@ -0,0 +1,5 @@
+{
+  "extends": "../../tsconfig-test.json",
+  "compilerOptions": { "paths": {} },
+  "exclude": ["e2e/assets/**"]
+}