fix(node-core): Align pino mechanism type with spec conventions (#19363)

In #18631 we noticed that Pino logs didn't match the [mechanism
types](https://develop.sentry.dev/sdk/data-model/event-payloads/exception/#exception-mechanism)
we are expecting, this PR addresses that.

Author: logaretm

dev-packages/node-integration-tests/suites/pino/test.ts

@@ -38,7 +38,7 @@ conditionalTest({ min: 20 })('Pino integration', () => {
                 type: 'Error',
                 value: 'oh no',
                 mechanism: {
-                  type: 'pino',
+                  type: 'auto.log.pino',
                   handled: true,
                 },
                 stacktrace: {
@@ -116,7 +116,7 @@ conditionalTest({ min: 20 })('Pino integration', () => {
                 type: 'Error',
                 value: 'oh no',
                 mechanism: {
-                  type: 'pino',
+                  type: 'auto.log.pino',
                   handled: true,
                 },
                 stacktrace: {
@@ -311,7 +311,7 @@ conditionalTest({ min: 20 })('Pino integration', () => {
                 type: 'Error',
                 value: 'Custom error key',
                 mechanism: {
-                  type: 'pino',
+                  type: 'auto.log.pino',
                   handled: true,
                 },
                 stacktrace: {

packages/node-core/src/integrations/pino.ts

@@ -162,7 +162,7 @@ const _pinoIntegration = defineIntegration((userOptions: DeepPartial<PinoOptions
 
               addExceptionMechanism(event, {
                 handled: options.error.handled,
-                type: 'pino',
+                type: 'auto.log.pino',
               });
 
               return event;