feat(spanv2): Implement PII scrubbing (#5168)

This ports the PII scrubbing logic from logs to spans V2 pretty much
unchanged. I ported over most tests as well, the one exception being
`test_ourlog_extraction_default_pii_scrubbing_does_not_scrub_default_attributes`
because I couldn't make it work—there's some difference in the pipelines
between logs and spans that makes this nontrivial.

I also added some tests for the scrubbing of span links (since they can
have attributes of their own), everything is working as expected there.

Closes #5131. Closes RELAY-155.

---------

Co-authored-by: David Herberth <[email protected]>

Author: loewenheim

CHANGELOG.md

@@ -20,6 +20,7 @@
 - Maps `unknown_error` span status to `internal_error`. ([#5202](https://github.com/getsentry/relay/pull/5202))
 - Add `otp` and `two[-_]factor` to default scrubbing rules. ([#5250](https://github.com/getsentry/relay/pull/5250))
 - Add event merging logic for Playstation crashes. ([#5228](https://github.com/getsentry/relay/pull/5228))
+- Implement PII scrubbing for V2 spans. ([#5168](https://github.com/getsentry/relay/pull/5168))
 
 **Bug Fixes**:
 

relay-config/src/config.rs

@@ -617,7 +617,7 @@ pub struct Limits {
     pub max_profile_size: ByteSize,
     /// The maximum payload size for a trace metric.
     pub max_trace_metric_size: ByteSize,
-    /// The maximum payload size for a span.
+    /// The maximum payload size for a log.
     pub max_log_size: ByteSize,
     /// The maximum payload size for a span.
     pub max_span_size: ByteSize,