Add Support for "Cascading" Custom Field Type for Jira Integration

### Problem Statement Currently only custom field types that are supported for Jira integration is "single-select" Related to internal ticket [#161897](<https://sentry.zendesk.com/agent/tickets/161897>) ### Solution Brainstorm Add support for "cascading" custom field type to Jira integration ### Product Area Settings - Integrations We want to define a set of [lightweight metrics](<https://docs.sentry.io/product/explore/metrics/>) that SDKs can automatically collect for e.g. framework, language or platform, focusing only on signals that **do NOT overlap with Tracing**. Ideally these metrics should give a quick sense of app or runtime health, … while deeper investigation will still rely on traces or profiles.<br><br>Examples**:** * Node.js runtime metrics (e.g., event loop delay, heap usage) * Prisma-related metrics in Next.js * Mobile CPU / memory usage to help surface potential ANRs or app hangs --- **Candidate Metrics (add more below)** * … *(please also add ideas, questions or examples in comments)*