Routes cleanup

[SayakaOno]

Description

I noticed while upgrading react-router-dom that users could access routes that should be hidden.
This PR:

• removes /people and /farm for worker accounts (sidebar navs are hidden)
• comments out /add_task/edit_custom_task_update (this should've been hidden as part of "Comment out route for edit custom task type" ticket)
• remove unused imports (address Joyce's comment, thank you!! 🙏)

Jira link:

• https://lite-farm.atlassian.net/browse/LF-4922
• https://lite-farm.atlassian.net/browse/LF-4923
• https://lite-farm.atlassian.net/browse/LF-4940

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

• Passes test case
• UI components visually reviewed on desktop view
• UI components visually reviewed on mobile view
• Other (please explain)

Checklist:

• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• The precommit and linting ran successfully
• I have added or updated language tags for text that's part of the UI
• I have ordered translation keys alphabetically (optional: run pnpm i18n to help with this)
• I have added the GNU General Public License to all new files