Fix: Add OnDestroy and Subscription sink to prevent memory leaks in core components

[Anurag-elitx]

Description

Resolved major memory leak vulnerabilities across the application's most heavily used components (case-sheet, beneficiary-registration, and various sio-services). By correctly implementing Angular's OnDestroy lifecycle hook and using a Subscription sink pattern, we ensure that components and their associated data are properly garbage collected when an agent navigates away.

This addresses known performance degradation issues during long-running agent sessions and aligns with best practices for the upcoming Angular 19 migration.

Related to PSMRI/AMRIT#129

Changes Made

• Imported and implemented OnDestroy interface in critical components.
• Introduced a subscriptionSink = new Subscription() to pool active subscriptions.
• Wrapped open .subscribe() calls in this.subscriptionSink.add().
• Added ngOnDestroy() to tear down subscriptions upon component destruction.

Affected Components

• CaseSheetComponent
• BeneficiaryRegistration104Component
• SioGrievienceServiceComponent
• SioBloodOnCallServiceComponent
• SioFoodSafetyServiceComponent

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 7cdd44e9-e5b8-418f-8c08-a2af790021ba

📥 Commits

Reviewing files that changed from the base of the PR and between df5db19 and 9d576cc.

📒 Files selected for processing (5)

• src/app/beneficiary-registration-104/beneficiary-registration-104.component.ts
• src/app/case-sheet/case-sheet.component.ts
• src/app/sio-blood-on-call-service/sio-blood-on-call-service.component.ts
• src/app/sio-food-safety-service/sio-food-safety-service.component.ts
• src/app/sio-grievience-service/sio-grievience-service.component.ts

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🧪 Generate unit tests (beta)

• Create PR with unit tests

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