Feature: Implement delete group in meatball menu in mobile header

[ShoeheyOt]

Overview

Implement dropdown menu for 'delete group' at groupSinglePage

Review points

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Screen Captures

DeleteGroup.webm

References

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Notes

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Assignee Checklist:

• [X] The naming convention of the PR title is correct (See the comment at the top of this template)
• [X] The base branch is correct (See: Types of Branches)
• [X] The branch name follows the Branch Naming Conventions
• [X] The correct assignees and reviewers have been designated for this PR
• [X] The coding style follows the Coding Style Guide
• [X] All the related issues are associated with this PR
• [X] All criteria in the associated issues are met (please tick the checkboxes)
• [X] My changes do not generate new warnings or errors (especially in the console)

Reviewer Checklist:

• [x] Double-check the "Assignee Checklist"
• [x] The code follows the generic best practices and our Coding Style Guide
• [ ] The code is well-commented and easy to understand
• [x] The UI changes accurately reflect the provided design