Show issues and PRs without milestones in 'Contributions' preset view

[wx-03]

Summary:

Fixes #369

Type of change:

• 🐛 Bug Fix

Changes Made:

• Changed 'Contributions' preset view to include issues and PRs without a milestone

Screenshots:

Proposed Commit Message:

Include issues/PRs without milestones in 'Contributions' preset view

The 'Contributions' preset view doesn't include issues/PRs without a milestone.

However, issues and PRs without milestones are contributions as well, and should
be included in the 'Contributions' preset view.

Let's show issues and PRs without milestones in the 'Contributions' preset view as well.

Checklist:

• I have tested my changes thoroughly.
• I have created tests for any new code files created in this PR or provided a link to a issue/PR that addresses this.
• I have added or modified code comments to improve code readability where necessary.
• I have updated the project's documentation as necessary.

[Arif-Khalid]

Great succinct implementation.
A fantastic PR 😊.
LGTM!

[Arif-Khalid]

Before I merge the PR, could you craft the commit message according to the conventions outlined here
I understand it is a small PR that doesn't necessarily require such a comprehensive format but it would be good to standardize the convention even for small PRs.
You can refer to the commit messages of other closed PRs for inspiration.

[wx-03]

Before I merge the PR, could you craft the commit message according to the conventions outlined here I understand it is a small PR that doesn't necessarily require such a comprehensive format but it would be good to standardize the convention even for small PRs. You can refer to the commit messages of other closed PRs for inspiration.

@Arif-Khalid Thanks for the review, I've edited the commit message.