feat: Remove normalization of contexts

All of the context types documented in [1] are flat objects.

The new contexts.trace is the only key under contexts that may have
nested objects under contexts.trace.data. That value holds the data for
the Transaction Span and matches spans[].data for invidual Spans. At the
moment one of the data fields is heavily limited, while the other is
ignored by normalization.

[1]: https://develop.sentry.dev/sdk/event-payloads/contexts/

This is the simplest to implement fix to #2646, thus what I'm doing here
perhaps temporarily.

Fixes #2646

Author: rhcarvalho

packages/apm/src/integrations/tracing.ts

@@ -524,7 +524,7 @@ export class Tracing implements Integration {
     if (transactionSpan.op === 'pageload') {
       if (Tracing._lcp) {
         // Set the last observed LCP score.
-        transactionSpan.setData('_sentry_extra_metrics', JSON.stringify({ lcp: Tracing._lcp }));
+        transactionSpan.setData('_sentry_extra_metrics', { lcp: Tracing._lcp });
       }
     }
 

packages/core/src/baseclient.ts

@@ -289,7 +289,6 @@ export abstract class BaseClient<B extends Backend, O extends Options> implement
    * Normalized keys:
    * - `breadcrumbs.data`
    * - `user`
-   * - `contexts`
    * - `extra`
    * @param event Event
    * @returns Normalized event
@@ -313,9 +312,6 @@ export abstract class BaseClient<B extends Backend, O extends Options> implement
       ...(event.user && {
         user: normalize(event.user, depth),
       }),
-      ...(event.contexts && {
-        contexts: normalize(event.contexts, depth),
-      }),
       ...(event.extra && {
         extra: normalize(event.extra, depth),
       }),

packages/core/test/lib/base.test.ts

@@ -467,7 +467,7 @@ describe('BaseClient', () => {
       });
       expect(TestBackend.instance!.event!).toEqual({
         breadcrumbs: [normalizedBreadcrumb, normalizedBreadcrumb, normalizedBreadcrumb],
-        contexts: normalizedObject,
+        contexts: fourLevelsObject,
         event_id: '42',
         extra: normalizedObject,
         timestamp: 2020,
@@ -512,7 +512,7 @@ describe('BaseClient', () => {
       });
       expect(TestBackend.instance!.event!).toEqual({
         breadcrumbs: [normalizedBreadcrumb, normalizedBreadcrumb, normalizedBreadcrumb],
-        contexts: normalizedObject,
+        contexts: fourLevelsObject,
         event_id: '42',
         extra: normalizedObject,
         timestamp: 2020,