Adding support for negative filter ratios for TSVB (elastic#152053)

## Summary

This PR fixes elastic#150738 by adding support for negative denominators for
TSVB's filter ratios.

### Checklist

- [X] [Unit or functional
tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)
were updated or added to match the most common scenarios

Co-authored-by: Stratoula Kalafateli <efstratia.kalafateli@elastic.co>

src/plugins/vis_types/timeseries/server/lib/vis_data/request_processors/series/filter_ratios.js

@@ -62,7 +62,7 @@ export function ratios(req, panel, series, esQueryConfig, seriesIndex) {
               denominator: denominatorPath,
             },
             script:
-              'params.numerator != null && params.denominator != null && params.denominator > 0 ? params.numerator / params.denominator : 0',
+              'params.numerator != null && params.denominator != null && params.denominator != 0 ? params.numerator / params.denominator : 0',
           },
         });
       });

src/plugins/vis_types/timeseries/server/lib/vis_data/request_processors/series/filter_ratios.test.js

@@ -73,7 +73,7 @@ describe('ratios(req, panel, series, esQueryConfig, seriesIndex)', () => {
                     },
                     script:
                       'params.numerator != null && params.denominator != null &&' +
-                      ' params.denominator > 0 ? params.numerator / params.denominator : 0',
+                      ' params.denominator != 0 ? params.numerator / params.denominator : 0',
                   },
                 },
                 'metric-1-denominator': {
@@ -150,7 +150,7 @@ describe('ratios(req, panel, series, esQueryConfig, seriesIndex)', () => {
                     },
                     script:
                       'params.numerator != null && params.denominator != null &&' +
-                      ' params.denominator > 0 ? params.numerator / params.denominator : 0',
+                      ' params.denominator != 0 ? params.numerator / params.denominator : 0',
                   },
                 },
                 'metric-1-denominator': {

src/plugins/vis_types/timeseries/server/lib/vis_data/request_processors/table/filter_ratios.ts

@@ -63,7 +63,7 @@ export const filterRatios: TableRequestProcessorsFunction = ({
                 denominator: denominatorPath,
               },
               script:
-                'params.numerator != null && params.denominator != null && params.denominator > 0 ? params.numerator / params.denominator : 0',
+                'params.numerator != null && params.denominator != null && params.denominator != 0 ? params.numerator / params.denominator : 0',
             },
           });
         });