chore: clean up old files after analytics and XML consolidation

- Delete common/src/analytics-core.ts (moved to analytics/core.ts)
- Delete common/src/analytics.ts (moved to analytics/track-event.ts)
- Delete common/src/util/analytics-dispatcher.ts (moved to analytics/dispatcher.ts)
- Delete common/src/util/analytics-log.ts (moved to analytics/log-helpers.ts)
- Delete common/src/util/saxy.ts (moved to util/xml/saxy.ts)
- Delete common/src/util/xml-parser.ts (moved to util/xml/tool-call-parser.ts)
- Delete common/src/util/xml.ts (moved to util/xml/tag-utils.ts)
- Update trace-processing.ts imports

Author: brandonkachen