Add a log message indicating that the bundle configuration is being ignored for precompiled function app

We currently ignore an extension bundle configuration if the following conditions are true. However there is no explicit log statement that indicates that we are ignoring the bundle configuration. We need to add one to make sure any one looking at the logs is not confused.

1. Its a pre-compiled function app
2. Function app has extension bundle configured in host.json
3. Extension bundle id is `Microsoft.Azure.Functions.ExtensionBundle`
4. Extension bundle version is >= 2.0

Start by locating the host code that handles pre-compiled function apps and extension bundle configuration. Trace the path for Microsoft.Azure.Functions.ExtensionBundle with version 2.0 or later, then verify that logs clearly state when the bundle configuration is ignored under all four listed conditions.

Written by the indexing model from the issue text.