test: make the concurrency tests independent of the runner's load - #302

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, actions/setup-dotnet@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

Because this call is not awaited, execution of the current method continues before the call is completed. Consider applying the 'await' operator to the result of the call.

Because this call is not awaited, execution of the current method continues before the call is completed. Consider applying the 'await' operator to the result of the call.

Because this call is not awaited, execution of the current method continues before the call is completed. Consider applying the 'await' operator to the result of the call.

Cannot convert null literal to non-nullable reference type.

Cannot convert null literal to non-nullable reference type.

Possible null reference argument for parameter 'value' in 'void BsonSpanWriter.WriteString(string name, string value)'.

Possible null reference argument for parameter 'value' in 'void BsonSpanWriter.WriteString(string name, string value)'.

The result of the expression is always 'true' since a value of type 'int' is never equal to 'null' of type 'int?'

The result of the expression is always 'true' since a value of type 'int' is never equal to 'null' of type 'int?'

'TestDbContext.Storage' hides inherited member 'DocumentDbContext.Storage'. Use the new keyword if hiding was intended.

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