Logging pollutes log messages of contained programs

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Reproduction steps

Set GlobalSettings.LogConfiguration
Pass log messages from libgit2sharp to your own logging solution

Expected behavior

Libgit2sharp does not send an unidentifiable Logging enabled at level logmessage that we cannot disable

Actual behavior

Libgit2sharp sends an unidentifiable Logging enabled at level logmessage that we cannot disable and which confuses our users because it is not the same loglevel name as they set in our app config.

Version of LibGit2Sharp (release number or SHA1)

Operating system(s) tested; .NET runtime tested

首先追蹤 GlobalSettings.LogConfiguration，找到確切訊息 "Logging enabled at level" 的來源。驗證訊息是如何發出的，以及設定的 logging 行為是否可以抑制該訊息或正確識別它；完成標準是所包含的程式不再收到無法識別的訊息。