Standardize Copyright Disclaimer in *.cs Files

[MeenuyD]

In alignment with OpenTelemetry practices (examples https://github.com/open-telemetry/opentelemetry-demo/blob/f44860602656e2313f3cfe6f7e42a464a341786b/src/cartservice/src/Program.cs#L1C1-L2C39 and
https://github.com/open-telemetry/opentelemetry-cpp/blob/ad626cec4598165e0d297b0bdb3880968c5dfe88/api/include/opentelemetry/config.h#L1-L2), simplified the copyright disclaimer in all *.cs files to the format:

// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
This standardizes the copyright information and aligns it with our common practices across OpenTelemetry projects.
#4900

[MeenuyD]

Made changes to standardize the copyright disclaimer in the selected *.cs files. If it meets the project's standards, I am prepared to apply the same changes across all *.cs files upon your approval. The updated format is:

// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0

Please review, and I'll proceed accordingly."

[CodeBlanch]

@MeenuyD This is great! Please continue.

[reyang]

@MeenuyD FYI, https://github.com/open-telemetry/opentelemetry-dotnet/blob/main/build/stylecop.json needs to be changed to:

{
  "$schema": "https://raw.githubusercontent.com/DotNetAnalyzers/StyleCopAnalyzers/master/StyleCop.Analyzers/StyleCop.Analyzers/Settings/stylecop.schema.json",
  "settings": {
    "documentationRules": {
      "copyrightText": "Copyright The OpenTelemetry Authors\nSPDX-License-Identifier: Apache-2.0",
      "xmlHeader": false
    },
    "orderingRules": {
      "usingDirectivesPlacement": "outsideNamespace"
    }
  }
}

[utpilla]

@MeenuyD Could you please update the branch and fix the failing tests?

[reyang]

LGTM assuming all *.cs files will be updated.

[MeenuyD]

Should I do it now

[reyang]

Should I do it now

Yes please. Thanks!!!

[MeenuyD]

Can you please review the #4930