fix: [Cadence Schedules] Removing memo as it cannot be updated

[abhishekj720]

What changed?
Removing memo as it cannot be updated from UpdateScheduleRequest

Why?
Cannot be updated once created for schedule
Memo is set at StartWorkflowExecution and is immutable. SearchAttributes can be upserted.

How did you test it?
Design phase of feature

Potential risks
N.A.

Release notes
Removing memo as part of updateRequest

Documentation Changes
N/A

Reviewer Validation

PR Description Quality (check these before reviewing code):

• "What changed" provides a clear 1-2 line summary
  • Project Issue is linked
• "Why" explains the full motivation with sufficient context
• Testing is documented:
  • Unit test commands are included (with exact go test invocation)
  • Integration test setup/commands included (if integration tests were run)
  • Canary testing details included (if canary was mentioned)
• Potential risks section is thoughtfully filled out (or legitimately N/A)
• Release notes included if this completes a user-facing feature
• Documentation needs are addressed (or noted if uncertain)

[gitar-bot]

Code Review ✅ Approved

Clean removal of the non-updatable Memo field from UpdateScheduleRequest. No callers reference the removed field/method, and the change is consistent with the API constraint that memo cannot be updated.

Rules ❌ No requirements met

Repository Rules

❌ PR Description Quality Standards: Add GitHub issue link in summary and release notes, expand Why section with before/after context explaining memo immutability, include exact test commands instead of 'design phase', document breaking API change compatibility risks instead of N/A, and clarify documentation needs

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