feat(grouping): add more in-app exclusion rules for Rust (#87990)

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- `rust_begin_unwind` is often the top "in app" frame for Rust panics,
which makes it end up in the top level issue description even though
it's not informative at all
- `panic_fmt` is another possible entrypoint for panics that we were not
considering. At the moment it's redundant to add it, as the only
possible frame that is not in app above it is the aforementioned
`rust_begin_unwind`, but could be useful if new versions of Rust
introduce other "intermediate" frames with a different name
- I did not use `^-group -group` to not break grouping for existing
events

Author: lcian

src/sentry/grouping/enhancer/enhancement-configs/[email protected]

@@ -34,17 +34,20 @@ family:native path:/usr/local/lib/**                                 -app
 family:native path:/usr/local/Cellar/**                              -app
 family:native package:linux-gate.so*                                 -app
 
-# rust common modules
+# rust common modules/functions
 family:native function:std::*                                     -app
 family:native function:core::*                                    -app
 family:native function:alloc::*                                   -app
 family:native function:__rust_*                                   -app
+family:native function:rust_begin_unwind                          -app
 
 # rust borders
 family:native function:std::panicking::begin_panic                ^-group -group ^-app -app
 family:native function:core::panicking::begin_panic               ^-group -group ^-app -app
 family:native function:failure::backtrace::Backtrace::new         ^-group -group ^-app -app
 family:native function:error_chain::make_backtrace                ^-group -group ^-app -app
+family:native function:std::panicking::panic_fmt                  ^-app -app
+family:native function:core::panicking::panic_fmt                 ^-app -app
 
 # C++ borders
 family:native function:_CxxThrowException                         ^-group -group ^-app -app