Orleans Bank Account/Transaction sample is broken

[mikgr]

Orleans Bank Account/Transaction sample

• The sample code does not update the (override the old) grain state.
• As a result, the balance of all accounts remains 1000 even though they are transacting.

https://github.com/dotnet/samples/blob/main/orleans/BankAccount/AccountTransfer.Grains/AccountGrain.cs

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Issue metadata

• Issue type: sample-update

[joelsodias]

Same from here...

To make it work I had to rollback the imutability (#7011 )

[ReubenBond]

Fixed by #7019