fix: improve vector store test (#5121)

* 📝 (.github/changes-filter.yaml): Add new path to starter-projects test category
🔧 (index.tsx, inputFileComponent): Add data-testid attribute to input element for testing purposes
🔧 (index.tsx, popover): Increase padding-right value for password input field
🔧 (Vector Store.spec.ts): Update test to click on correct element with data-testid attribute for file upload
🔧 (Vector Store.spec.ts): Remove redundant code related to filling input field and clicking on button

* 🔧 (index.tsx): Update styles for inputComponent popover to improve layout and alignment.