[v9.3.x] Prometheus: Add present_over_time syntax highlighting (#72365)

Prometheus: Add present_over_time syntax highlighting (#72283)

add prometheus present_over_time syntax highlighting

to color present_over_time keyword for prometheus

(cherry picked from commit d96067985b)

Co-authored-by: stratomonitor <arnaud_lemaignen@yahoo.com>

public/app/plugins/datasource/prometheus/promql.ts

@@ -521,6 +521,12 @@ export const FUNCTIONS = [
     detail: 'last_over_time(range-vector)',
     documentation: 'The most recent point value in specified interval.',
   },
+  {
+    insertText: 'present_over_time',
+    label: 'present_over_time',
+    detail: 'present_over_time(range-vector)',
+    documentation: 'The value 1 for any series in the specified interval.',
+  },
 ];
 
 export const PROM_KEYWORDS = FUNCTIONS.map((keyword) => keyword.label);