view.js: Show query run date above outputs section
- Execution timestamp is already stored, let it just add it to the
query run status endpoint
- Show it above resultset in query output section, by making it
cohabit with the display of the execution time
- Giving up ES6 compatibility and changes eslint configuration
accordingly
Bug: T215831
Change-Id: I18eb0341bc872fd6f2fcdb91705cae5bc0f54b8c