ref(search): Drop filter_value from multi-select analytics

Per review, do not log the actual filter value in the
search.multi_value_selected event. Keep only the number of selections.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: JoshuaKGoldberg

static/app/components/searchQueryBuilder/index.spec.tsx

@@ -3313,7 +3313,6 @@ describe('SearchQueryBuilder', () => {
           expect.objectContaining({
             search_source: 'ourlogs',
             filter_key: 'browser.name',
-            filter_value: 'Chrome',
             selected: true,
             selected_count: 2,
           })
@@ -3343,7 +3342,6 @@ describe('SearchQueryBuilder', () => {
           expect.objectContaining({
             search_source: 'ourlogs',
             filter_key: 'browser.name',
-            filter_value: 'Chrome',
             selected: false,
             selected_count: 1,
           })

static/app/components/searchQueryBuilder/tokens/filter/valueCombobox.tsx

@@ -608,7 +608,6 @@ function ItemCheckbox({
 
             trackAnalytics('search.multi_value_selected', {
               ...analyticsData,
-              filter_value: value,
               selected: !currentlySelected,
               selected_count: currentlySelected ? selectedCount - 1 : selectedCount + 1,
             });

static/app/utils/analytics/searchAnalyticsEvents.tsx

@@ -60,7 +60,6 @@ export type SearchEventParameters = {
   'search.multi_value_selected': Omit<SearchEventBase, 'query'> & {
     filter_key: string;
     filter_operator: string;
-    filter_value: string;
     filter_value_type: string;
     selected: boolean;
     selected_count: number;