Dashboard: Fix Active Users calculation in team and project analytics charts (#7854)

<!--

## title your PR with this format: "[SDK/Dashboard/Portal] Feature/Fix: Concise title for the changes"

If you did not copy the branch name from Linear, paste the issue tag here (format is TEAM-0000):

## Notes for the reviewer

Anything important to call out? Be sure to also clarify these in your comments.

## How to test

Unit tests, playground, etc.

-->

<!-- start pr-codex -->

---

## PR-Codex overview
This PR focuses on modifying the `aggregateFn` function in two files related to analytics highlights cards, ensuring consistent functionality for aggregating data.

### Detailed summary
- In both `highlights-card.tsx` files, the `aggregateFn` function is updated to include logic for handling the `activeUsers` key.
- The function calculates the maximum value for `activeUsers` and sums values for other keys.

> ✨ Ask PR-Codex anything about this PR by commenting with `/codex {your question}`

<!-- end pr-codex -->

<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit

* **Bug Fixes**
  * Standardized analytics aggregation across Highlights cards. All metrics, including Active Users, now show the total over the selected period (previously Active Users showed the peak value). Expect updated figures in both Team Analytics Highlights and Project Overview Highlights, ensuring consistency between summary cards and detailed views.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Author: MananTank

apps/dashboard/src/app/(app)/team/[team_slug]/(team)/~/analytics/highlights-card.tsx

@@ -76,9 +76,6 @@ export function TeamHighlightsCard({
           : "activeUsers"
       }
       aggregateFn={(_data, key) => {
-        if (key === "activeUsers") {
-          return Math.max(...timeSeriesData.map((d) => d[key]));
-        }
         return timeSeriesData.reduce((acc, curr) => acc + curr[key], 0);
       }}
       chartConfig={chartConfig}

apps/dashboard/src/app/(app)/team/[team_slug]/[project_slug]/(sidebar)/overview/highlights-card.tsx

@@ -70,9 +70,6 @@ export function ProjectHighlightsCard(props: {
           : "activeUsers"
       }
       aggregateFn={(_data, key) => {
-        if (key === "activeUsers") {
-          return Math.max(...timeSeriesData.map((d) => d[key]));
-        }
         return timeSeriesData.reduce((acc, curr) => acc + curr[key], 0);
       }}
       chartConfig={chartConfig}