fix(explore/logs) not collapsing whitespace (#15737)

- Set container width to 100% so column widths can be calculated properly
- Sets duplicates, level, timestamp, local time to a fixed width based upon em units since the size of these are static
- Sets labels to be 20%
- Remove min-width:80% on message column so that it now consumes remaining space
- Additionally fixes long labels from overflowing into the messages column by properly setting a max-width per label and hiding overflow

closes #15673

Signed-off-by: Steven Sheehy <ssheehy@firescope.com>

public/app/features/explore/LogRow.tsx

@@ -150,7 +150,7 @@ export class LogRow extends PureComponent<Props, State> {
           </div>
         )}
         {showLocalTime && (
-          <div className="logs-row__time" title={`${row.timestamp} (${row.timeFromNow})`}>
+          <div className="logs-row__localtime" title={`${row.timestamp} (${row.timeFromNow})`}>
             {row.timeLocal}
           </div>
         )}