fix(pg-instrumentation): capture query values when passed as second argument for prepared statements

[aryamohanan]

Which problem is this PR solving?

Fixes #3193

When using prepared statements with the following syntax, query parameter values were not captured even when enhancedDatabaseReporting: true was enabled:

client.query(
  { name: 'statement_name', text: 'SELECT * FROM pg_tables WHERE schemaname = $1' },
  ['public']
);

Short description of the changes

• Fixed missing parameter values when executing prepared statements.
• Updated instrumentation to correctly read values from the second argument (args[1]) when the first argument is a query config object.
• Ensured that db.postgresql.values is only recorded when enhancedDatabaseReporting:true.
• Maintained query text sanitization, placeholders ($1, $2, etc.) remain in db.statement.