fix:added mid range time filters

[sphurthy]

Description

Related PRS (if any):

None

Main changes explained:

• Added three time filter options to the no-show rate insights dropdown: "Last 3 Months", "Last 6 Months", and "Last 12 Months".
• Updated filterByDate to compute rolling date windows backward from today for the new filters.
• Implemented inclusive date ranges with proper time boundaries (00:00:00 for start, 23:59:59 for end) to ensure accurate filtering.
• Maintained backward compatibility with existing filters (Today, This Week, This Month, All Time).

How to test:

1. check into current branch
2. do npm install and ... to run this PR locally
3. Clear site data/cache
4. Navigate to the Community Portal participation reports page (communityportal/reports/participation).
5. Open the no-show rate insights section and verify the dropdown includes the new options: "Last 3 Months", "Last 6 Months", and "Last 12 Months".
6. Select "Last 3 Months" and confirm the bar chart shows aggregated data only for events from 3 months ago through today.
7. Select "Last 6 Months" and verify the chart displays data for the 6-month rolling window.
8. Select "Last 12 Months" and confirm the chart shows data for the 12-month rolling window.

Screenshots or videos of changes:

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud