fix(insights): DB domain & action dropdown empty options (#78681)

- The `(No Command)` option has been removed specifically for MongoDB,
since MongoDB queries cannot have no command
- We were adding `(empty)` as an extra option in the domain selector
(also in the Assets module) because the backend returns this, but we
also manually append it in the component. Now we filter out this option
so there is no redundancy

---------

Co-authored-by: Dominik Buszowiecki <44422760+DominikB2014@users.noreply.github.com>

Author: 0Calories

static/app/views/insights/common/views/spans/selectors/actionSelector.tsx

@@ -15,6 +15,7 @@ import {useSpansQuery} from 'sentry/views/insights/common/queries/useSpansQuery'
 import {buildEventViewQuery} from 'sentry/views/insights/common/utils/buildEventViewQuery';
 import {QueryParameterNames} from 'sentry/views/insights/common/views/queryParameters';
 import {EmptyContainer} from 'sentry/views/insights/common/views/spans/selectors/emptyOption';
+import {SupportedDatabaseSystem} from 'sentry/views/insights/database/utils/constants';
 import {ModuleName, SpanMetricsField} from 'sentry/views/insights/types';
 
 const {SPAN_ACTION} = SpanMetricsField;
@@ -70,6 +71,11 @@ export function ActionSelector({value = '', moduleName, spanCategory, filters}:
         },
       ];
 
+  // The empty option is not necessary for MongoDB, since all queries will have a command
+  if (filters?.['span.system'] === SupportedDatabaseSystem.MONGODB) {
+    options.pop();
+  }
+
   return (
     <CompactSelect
       style={{maxWidth: '200px'}}

static/app/views/insights/common/views/spans/selectors/domainSelector.tsx

@@ -94,12 +94,15 @@ export function DomainSelector({
 
   const {options: domainOptions, clear: clearDomainOptionsCache} =
     useCompactSelectOptionsCache(
-      incomingDomains.filter(Boolean).map(datum => {
-        return {
-          value: datum,
-          label: datum,
-        };
-      })
+      incomingDomains
+        .filter(Boolean)
+        .filter(domain => domain !== EMPTY_OPTION_VALUE)
+        .map(datum => {
+          return {
+            value: datum,
+            label: datum,
+          };
+        })
     );
 
   useEffect(() => {