fix: batch fetch repositories for integrations

[themarolt]

Note

Medium Risk
Changes how integration settings are hydrated (batch DB queries and shared QueryExecutor), which could affect returned settings for GitHub/GitHub-Nango integrations if grouping/mapping logic has edge cases. Functional scope is limited and primarily performance-oriented.

Overview
Batches integration hydration to avoid N+1 queries. IntegrationRepository._populateRelationsForRows now pre-fetches Nango mappings and GitHub repos for all relevant integrations in one pass, then injects settings.nangoMapping and settings.orgs[].repos from those results.

Updates DAL APIs and call sites to support multi-ID lookups. Replaces single-integration helpers with getNangoMappingsForIntegrations and getReposGroupedByOrgForIntegrations, and threads a shared QueryExecutor through integration population and Nango cron/worker scripts to use the new batched interfaces.

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