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[bot]]

Here is the summary of changes.

You are about to add 1 region tag.

- [sheets/removingDuplicates/removingDuplicates.gs:35](https://github.com/googleworkspace/apps-script-samples/blob/15e58e1b0b14e02e8a33a25effe5c0777a553643/sheets/removingDuplicates/removingDuplicates.gs#L35), tag `apps_script_sheets_new_data`

You are about to delete 1 region tag.

- [sheets/removingDuplicates/removingDuplicates.gs:26](https://github.com/googleworkspace/apps-script-samples/blob/290cd98777c6db0db6efdc76b34ab01f4f36825c/sheets/removingDuplicates/removingDuplicates.gs#L26), tag `apps_script_sheets_new_data`

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