Erroneous warning on unset options during FFI table operation

[timsaucer]

Describe the bug

When you use an FFI Table Provider, we create a session context by parsing a string representation of a session config. This happens in this line.

The problem is this is setting a deprecated option enable_options_value_normalization to the same value it already has. This generates a warning even though we aren't actually changing the value. This line is where we generate the warning.

This warning is erroneous and confusing to the user.

To Reproduce

Create a config. Set this value to the same as it already has. Warning will be generated.

Expected behavior

We probably do want the warning any time a user tries to set the variable, even if to the default. So instead what we may want to do is when creating a session config from a hash table of key/value pairs remove any that are not the same as the defaults.

Additional context

No response

[chenkovsky]

take