feat: update agents to include observability tracing policy

- Added `InternalSpans` import from `@mastra/core/observability` in multiple agent files.
- Updated options in various agents to include a tracing policy with `internal: InternalSpans.ALL`.
- Removed commented-out code for `convertDataFormatTool` and `processXMLTool` in `dataTransformationAgent.ts`.
- Ensured all agents now have a consistent tracing policy setup for improved observability.
- Adjusted memory configurations in `codingAgents.ts` to use `pgMemory` instead of `upstashMemory`.
- Cleaned up agent configurations for better maintainability and clarity.