feat: update APM instrumentation

[sebastiendan]

Description

This PR updates the APM instrumentation to focus on frontend->backend requests and get a different APM Transaction per request. New labels are also added to make sure we know everything about users' requests.

Fixes TOO-341

Additions and Changes

• NodeJS APM agent bootstrapped changes from local in main.ts to an actual NestJS service (similarly to what was recently done on the Executor Service)
• Elastic RUM (browser) instrumentation now creates a different APM transaction per faucet backend request
• New labels show complete data about users' requests

PR Checklist:

• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added or updated tests that comprehensively prove my change is effective or that my feature works