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[release/7.0] Disable EventSource support in NativeAOT by default (#7…
…6052) * Disable EventSource support in NativeAOT by default `DiagnosticSource` is currently not AOT compatible. If a machine-wide DiagnosticSource-related event listener is enabled (such as PerfView, or possibly even a managed VS debugging session) it activates `DiagnosticSource` code paths within the executable and basically injects a runtime failure into NativeAOT processes due to the AOT-incompatibility of the code. E.g. trying to do a `HttpClient` web request with PerfView collecting in the background causes a runtime exception to be thrown. This uses the documented switch to disable `EventSource` support (unless the user specified a different value). Indirectly, it disables `DiagnosticSource` as well. As a side effect, disabling `EventSource` drops the size of a NativeAOT-compiled Hello World from 3.48 MB to 2.85 MB 🥳. * Fix tests * Update Microsoft.Extensions.Hosting.Unit.Tests.csproj * Cherry-pick relevant parts of #76114 * Port one more test fix Co-authored-by: Michal Strehovský <MichalStrehovsky@users.noreply.github.com>
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