Request to add PG::TRSerializationFailure handling to 6-1-stable

[harelsafra]

Hi,
We migrated to CRDB and are getting sporadic PG::TRSerializationFailure errors, currently using the PG driver.
We're using rails 6.1.7.3 and so need to use the 6.1 gem, and it looks like it doesn't catch and retry PG::TRSerializationFailure errors
https://github.com/cockroachdb/activerecord-cockroachdb-adapter/blob/6-1-stable/lib/active_record/connection_adapters/cockroachdb/transaction_manager.rb
While the master branch does have this handling

activerecord-cockroachdb-adapter/lib/active_record/connection_adapters/cockroachdb/transaction_manager.rb

Line 58 in 0f9a418

errors.any? {|e| e.is_a? PG::TRSerializationFailure }

Can this functionality please be added to 6.1?
I tried to fork the repo and add this but I got a lot of failing test cases, even before I changed anything 😢

Thanks

[BuonOmo]

@harelsafra there are indeed failing tests around this (see #333). I'm working on it now. I don't feel safe backporting this knowing that there are some unresolved bugs.

[harelsafra]

Thanks @BuonOmo , I'll follow #333