Undo breaking change in 6.0 in environment variable configuration prefix support #62819
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When using environment variable configuration, brings back support for prefix being normalized like it was in dotnet 5.0.
The prefix is expected to use ":" to work (refer to updated tests).
Fixing regression from last release. Revert changes made in https://github.com/dotnet/runtime/pull/42932/files while updating tests to reduce ambiguity.
Fixes #61577