Reduce module cache size (#33057)

This PR reduces the max module cache size from 250MB to 100MB, which is the max push size. We could make this lower if we stop fetching all modules on cache miss, but if we set it lower now, it will make the cache useless for larger codebases.

GitOrigin-RevId: 5e752b4771358b518cbf65707a8be061e15a09dc

crates/common/src/knobs.rs

@@ -920,7 +920,7 @@ pub static ARCHIVE_FETCH_TIMEOUT_SECONDS: LazyLock<Duration> =
 /// The total number of modules across all versions that will be held in memory
 /// at once.
 pub static MODULE_CACHE_MAX_SIZE_BYTES: LazyLock<u64> =
-    LazyLock::new(|| env_config("MODULE_CACHE_MAX_SIZE_BYTES", 250_000_000));
+    LazyLock::new(|| env_config("MODULE_CACHE_MAX_SIZE_BYTES", 100_000_000));
 
 /// The maximum number of concurrent module fetches we'll allow.
 pub static MODULE_CACHE_MAX_CONCURRENCY: LazyLock<usize> =