[release/6.0-preview7] Fix an error printed out when install_location file is missing #56330
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Backport of #56327 to release/6.0-preview7
/cc @agocke @vitek-karas
Customer Impact
The changes for multi-arch caused what should be a COREHOST_TRACE diagnostic to be output as an error to stderr instead of being silent as normal.
The other app behavior does not change, but many people scrape the output of their app, and the extra text will break them.
This only occurs when using the apphost, which mostly isn’t used in CI.
Testing
Unit tests
Risk
Low. Changes only a call to the error helper.