Add new document types to constants

[alwaysalearner1234]

Description

Added 'task', 'target', and 'user-settings' to DOC_TYPES to replace magic strings.

This ensures a single source of truth and improves maintainability.

#10548

[dianabarsan]

Hi @alwaysalearner1234

Thanks for submitting this PR and your interest in the CHT.
Unfortunately adding the constants is only the first step, the second step would be to replace all occurrences of where these doc types are used throughout the codebase with the constant.
Are you available to complete that work?

Thanks!

[alwaysalearner1234]

Hi @dianabarsan,
Thank you for the feedback and for reviewing my PR. Yes, I can work on the next step. I will go through the codebase and replace all occurrences of these document types with the defined constants to ensure consistency.
I'll update the PR once the changes are completed. Please let me know if there are any specific areas you would like me to focus on.
Thanks!

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