## What does this PR do?
When a filter segment is selected and the user clicks it again to deselect, this PR now clears all active filters in addition to deselecting the segment.
Previously, deselecting a segment only called `setSegmentId(null)`, which removed the segment selection but left the filters in place. Now it calls `clearAll()` which clears both the segment selection and all active filters.
## Mandatory Tasks (DO NOT REMOVE)
- [x] I have self-reviewed the code (A decent size PR without self-review might be rejected).
- [x] I have updated the developer docs in /docs if this PR makes changes that would require a [documentation change](https://cal.com/docs). N/A - no documentation changes needed.
- [x] I confirm automated tests are in place that prove my fix is effective or that my feature works.
## How should this be tested?
1. Go to a page with DataTable and filter segments (e.g., Bookings page or Organization Members page)
2. Select a filter segment (e.g., "My Bookings" system segment or a user-created segment)
3. Verify filters are applied (URL contains `activeFilters`)
4. Click the same segment again to deselect it
5. Verify the segment is deselected AND all filters are cleared (URL should no longer contain `activeFilters`)
An e2e test has been added to `filter-segment.e2e.ts`:
- `Deselecting a segment clears all active filters`
## Checklist
- [x] My code follows the style guidelines of this project
- [x] I have checked if my changes generate no new warnings
## Human Review Checklist
- [ ] Verify that calling `clearAll()` instead of `setSegmentId(null)` is the intended behavior (clears both segment selection and all active filters)
- [ ] Consider if there are use cases where users might want to keep filters when deselecting a segment
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> **Link to Devin run**: https://app.devin.ai/sessions/44f22b80d9c442bdb334d04dac2b476d
> **Requested by**: @eunjae-lee
