[Codacy/BestPractice] Change this constant to a 'static' read-only property.

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Codacy Issue ID: ce990c20c04d5835b0f6cc40a667f22

Field	Value
File	TransactionProcessing.MerchantFileProcessor/Services/FileStatusStore.cs
Line	74
Rule	BestPractice
Severity	Warning
Commit	bcad00618c8f4810aad04dbfafc002763540c4c9

Message: Change this constant to a 'static' read-only property.

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Code Snippet:

public const string NotProcessed = "NotProcessed";