chore(admin): Delete unused code from fxa-shared

Because:
- Cleaning up code duplication, in favor of code ported to libs

This Commit:
- Deletes unreferenced code

Author: dschom

packages/fxa-shared/README.md

@@ -93,15 +93,15 @@ Or by building up the new set in place:
 
 This utility allows for easy configuration of tracing. To use this in a service:
 
-- Add the config chunk in fxa-shared/tracing/config to your packages's config.
+- Add the config chunk in @fxa/shared/otel to your packages's config.
 
 - Then initialize as follows. This invocation should happen as early as possible in the service's or app's lifecycle. Ideally it's
   the first thing done, even before importing other modules.
 
 ```
 // For services
 const config = require('../config');
-require('fxa-shared/tracing/node-tracing').initTracing(config.get('tracing'));
+require('@fxa/shared/otel').initTracing(config.get('tracing'));
 ```
 
 To see traces on your local system, set the following environment variables:
@@ -122,7 +122,7 @@ TRACING_OTEL_COLLECTOR_JAEGER_ENABLED=true
 
 ```
 
-The default config for tracing found at fxa-shared/tracing/config.ts will pick up these variables and result in traces showing up in Jaeger which runs locally at `localhost:16686`.
+The default config for tracing found at @fxa/shared/otel will pick up these variables and result in traces showing up in Jaeger which runs locally at `localhost:16686`.
 
 It's important to note that sentry also supports tracing integration. So we typically let a call to 'initSentry', a function located in the sentry/node.ts module do the work of initializing tracing.
 

packages/fxa-shared/monitoring/index.ts

@@ -121,10 +121,6 @@
       "import": "./dist/esm/packages/fxa-shared/log/*.js",
       "require": "./dist/cjs/packages/fxa-shared/log/*.js"
     },
-    "./monitoring": {
-      "import": "./dist/esm/packages/fxa-shared/monitoring/index.js",
-      "require": "./dist/cjs/packages/fxa-shared/monitoring/index.js"
-    },
     "./metrics/*": {
       "import": "./dist/esm/packages/fxa-shared/metrics/*.js",
       "require": "./dist/cjs/packages/fxa-shared/metrics/*.js"
@@ -169,14 +165,6 @@
       "import": "./dist/esm/packages/fxa-shared/scripts/*.js",
       "require": "./dist/cjs/packages/fxa-shared/scripts/*.js"
     },
-    "./sentry": {
-      "import": "./dist/esm/packages/fxa-shared/sentry/index.js",
-      "require": "./dist/cjs/packages/fxa-shared/sentry/index.js"
-    },
-    "./sentry/*": {
-      "import": "./dist/esm/packages/fxa-shared/sentry/*.js",
-      "require": "./dist/cjs/packages/fxa-shared/sentry/*.js"
-    },
     "./speed-trap/*": {
       "import": "./dist/esm/packages/fxa-shared/speed-trap/*.js",
       "require": "./dist/cjs/packages/fxa-shared/speed-trap/*.js"
@@ -185,10 +173,6 @@
       "import": "./dist/esm/packages/fxa-shared/subscriptions/*.js",
       "require": "./dist/cjs/packages/fxa-shared/subscriptions/*.js"
     },
-    "./tracing/*": {
-      "import": "./dist/esm/packages/fxa-shared/tracing/*.js",
-      "require": "./dist/cjs/packages/fxa-shared/tracing/*.js"
-    },
     "./test/db/models/auth/*": {
       "import": "./dist/esm/packages/fxa-shared/test/db/models/auth/*.js",
       "require": "./dist/cjs/packages/fxa-shared/test/db/models/auth/*.js"