Backport to branch(3) : Add missing default values to CLI argument descriptions in the import command

[feeblefakie]

This is an automated backport of the following:

• Original PR: Add missing default values to CLI argument descriptions in the import command #3059
• Backported commit: 678ec17

Please merge this PR after all checks have passed.

[gemini-code-assist]

Summary of Changes

Hello @feeblefakie, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request improves the user experience of the data loader's import command by making its command-line argument descriptions more informative. It specifically adds the default values to the descriptions of key options, allowing users to quickly understand the expected behavior without needing to consult additional documentation. This change is an automated backport from a prior commit.

Highlights

• CLI Argument Descriptions: Updated the descriptions for several command-line arguments in the import command to include their default values, enhancing clarity for users.
• Automated Backport: This pull request is an automated backport of a previously merged commit, ensuring consistency across branches.

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[gemini-code-assist]

Code Review

This pull request is a backport that adds missing default values to the descriptions of several CLI arguments in the import command. The changes improve the usability of the command-line interface by making the default behaviors clearer to the user. The changes are correct and useful. I have one suggestion to improve code readability by splitting a very long description string into multiple lines.