fix: Update Removing Duplicates to use object for uniqueness check

[vinay-google]

Description

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.

Fixes # (issue)

Is it been tested?

• Development testing done

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have performed a peer-reviewed with team member(s)
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules

[snippet-bot]

Here is the summary of changes.

You are about to add 1 region tag.

• sheets/removingDuplicates/removingDuplicates.gs:35, tag apps_script_sheets_new_data

You are about to delete 1 region tag.

• sheets/removingDuplicates/removingDuplicates.gs:26, tag apps_script_sheets_new_data

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