Staunch CI bleeding from #15995. (#16064)

Band-aids #15995 in CI.

[ci skip-rust]

pants.toml

@@ -68,8 +68,11 @@ unmatched_build_file_globs = "error"
 # NB: Users must still set `--remote-cache-{read,write}` to enable the remote cache.
 remote_store_address = "grpcs://cache.toolchain.com:443"
 remote_auth_plugin = "toolchain.pants.auth.plugin:toolchain_auth_plugin"
+
 # See https://github.com/pantsbuild/pants/issues/11331.
-remote_cache_eager_fetch = false
+# N.B.: Switched back to eager due to issues documented in:
+#   https://github.com/pantsbuild/pants/issues/15995
+remote_cache_eager_fetch = true
 
 [anonymous-telemetry]
 enabled = true