Update variable declarations

[fivetran-avinash]

PR Overview

This PR will address the following Issue/Feature: Internal Height ticket

This PR will result in the following new package version: 0.11.1

Please provide the finalized CHANGELOG entry which details the relevant changes included in this PR:

Macro Updates

• Introduced a local version of the fill_pass_through_columns macro that directly calls the variables within our staging models. This removes the existing string-to-variable conversion and leads to cleaner parsing.
• This new macro is applied to all staging models with passthrough column functionality, and replaces the existing fill_pass_through_columns macro.
  • stg_netsuite and stg_netsuite2 models impacted include: accounts, classes, consolidated_exchange_rates, customers, departments, items, locations, subsidiaries, transaction_lines, transactions, and vendors.
• Similar changes are being made on a simultaneous release to the persist_pass_through_columns macro in the dbt_netsuite package. See the release notes for more details.
• The process for adding passthrough columns remains unchanged. Consult the README for more details.

PR Checklist

Basic Validation

Please acknowledge that you have successfully performed the following commands locally:

• dbt run –full-refresh && dbt test
• dbt run (if incremental models are present) && dbt test

Before marking this PR as "ready for review" the following have been applied:

• The appropriate issue has been linked, tagged, and properly assigned
• All necessary documentation and version upgrades have been applied
• docs were regenerated (unless this PR does not include any code or yml updates)
• BuildKite integration tests are passing
• Detailed validation steps have been provided below

Detailed Validation

Please share any and all of your validation steps:

Ran on multiple variations of passthrough columns (with name, with alias, with multiple passthrough columns, with no passthrough columns).

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