Omit source code info from well known types descriptors

[codecov[bot]]

Codecov Report

Patch coverage has no change and project coverage change: +0.15 :tada:

Comparison is base (3e840e8) 75.34% compared to head (8c77ee4) 75.50%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #43 +/- ## ========================================== + Coverage 75.34% 75.50% +0.15% ========================================== Files 31 31 Lines 5253 5254 +1 ========================================== + Hits 3958 3967 +9 + Misses 1295 1287 -8 ``` | [Impacted Files](https://codecov.io/gh/andrewhickman/prost-reflect/pull/43?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Andrew+Hickman) | Coverage Δ | | |---|---|---| | [prost-reflect/src/reflect/wkt.rs](https://codecov.io/gh/andrewhickman/prost-reflect/pull/43?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Andrew+Hickman#diff-cHJvc3QtcmVmbGVjdC9zcmMvcmVmbGVjdC93a3QucnM=) | `83.33% <ø> (ø)` | | ... and [5 files with indirect coverage changes](https://codecov.io/gh/andrewhickman/prost-reflect/pull/43/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Andrew+Hickman)

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