config(congestion_control) - set max_congestion_missed_chunks to 2

[wacban]

Setting the max_congestion_missed_chunks to 2. This means that at most 2 (+/-1) chunks worth of outgoing receipts can accumulate before all shards will stop forwarding any receipts to the shard with missing chunks. This is a relatively conservative limit to minimize the impact of incoming receipts on source_receipt_proofs size in the state witness. I expect it to have minimal impact on the total throughput of the chain since it's quite rare to see more than one missed chunk in a row.

It's also worth noting that just having one missed chunk is a special case that will not increase the congestion level:

nearcore/core/primitives/src/congestion_info.rs

Lines 65 to 68 in dd1e278

	fn missed_chunks_congestion(&self) -> f64 {
	if self.missed_chunks_count <= 1 {
	return 0.0;
	}

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.36%. Comparing base (dd1e278) to head (61686b4).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #11473      +/-   ##
==========================================
- Coverage   71.37%   71.36%   -0.01%     
==========================================
  Files         787      787              
  Lines      159064   159099      +35     
  Branches   159064   159099      +35     
==========================================
+ Hits       113529   113539      +10     
- Misses      40623    40646      +23     
- Partials     4912     4914       +2     

Flag	Coverage Δ
backward-compatibility	0.23% <0.00%> (-0.01%)	⬇️
db-migration	0.23% <0.00%> (-0.01%)	⬇️
genesis-check	1.37% <0.00%> (-0.01%)	⬇️
integration-tests	37.52% <18.18%> (+0.01%)	⬆️
linux	68.85% <18.18%> (-0.03%)	⬇️
linux-nightly	70.89% <100.00%> (+0.01%)	⬆️
macos	50.85% <0.00%> (-1.65%)	⬇️
pytests	1.58% <0.00%> (-0.01%)	⬇️
sanity-checks	1.38% <0.00%> (-0.01%)	⬇️
unittests	66.07% <81.81%> (-0.04%)	⬇️
upgradability	0.28% <0.00%> (-0.01%)	⬇️

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