perf: remove _count children query from EventType and Workflow repositories

[keithwillcode]

What does this PR do?

Removes the _count: { select: { children: true } } pattern from Prisma queries that was generating expensive aggregate queries like:

SELECT ... COALESCE("aggr_selection_0_EventType"."_aggr_count_children", 0) AS "_aggr_count_children" 
FROM "public"."EventType" 
LEFT JOIN (SELECT "public"."EventType"."parentId", COUNT(*) AS "_aggr_count_children" FROM "public"."EventType" WHERE 1=1 GROUP BY "public"."EventType"."parentId") AS "aggr_selection_0_EventType" ...

Changes:

• Removed _count children select from eventTypeRepository.ts (2 occurrences in workflow-related queries)
• Removed _count children select from WorkflowRepository.ts (4 occurrences)
• Updated WorkflowListType type definition to remove the _count property
• Updated WorkflowListPage.tsx to no longer display the child count (+N) in tooltips

Updates since last revision

• Added cache bust comment in get.handler.ts to force Turborepo to regenerate TRPC types (workaround for cyclic dependency between @calcom/trpc and @calcom/features preventing proper cache invalidation)

Mandatory Tasks (DO NOT REMOVE)

• I have self-reviewed the code (A decent size PR without self-review might be rejected).
• I have updated the developer docs in /docs if this PR makes changes that would require a documentation change. N/A - no docs changes needed
• I confirm automated tests are in place that prove my fix is effective or that my feature works.

How should this be tested?

1. Navigate to the Workflows page
2. Verify workflows still display correctly
3. Hover over the "Active on X event types" badge to see the tooltip
4. Confirm event type titles display without the (+N) child count suffix
5. Verify no console errors or broken functionality

Checklist

• My code follows the style guidelines of this project
• I have checked if my changes generate no new warnings
• My PR is appropriately sized

---

Link to Devin run: https://app.devin.ai/sessions/6c7de59aad554dd59c7db4d50cf6e53d
Requested by: @keithwillcode

Human Review Notes

• The import reordering in some files is from Biome auto-formatting, not functional changes
• The UI will no longer show child event type counts in workflow tooltips - this is intentional per the request
• The cache bust comment in get.handler.ts is a workaround to force TRPC type regeneration due to Turborepo caching issues (cyclic dependency prevents adding @calcom/features as a proper dependency of @calcom/trpc)

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[cubic-dev-ai]

No issues found across 4 files

[emrysal]

Approved