feat: admin user check middleware

[bikrantjajware]

Fixes Issue

Closes #8389

Changes proposed

• Added middleware to check admin usernames on route "/admin" and "/api/admin"
• removed Admin username check from individual admin files

Check List (Check all the applicable boxes)

• [X ] My code follows the code style of this project.
• My change requires changes to the documentation.
• I have updated the documentation accordingly.
• [X ] All new and existing tests passed.
• [ X] This PR does not contain plagiarized content.
• [ X] The title of my pull request is a short description of the requested changes.

Screenshots

Note to reviewers

NOTE:

• Using process.env in middleware file instead of serverEnv to avoid errors thrown while using Node APIs in edge runtime
• Did not remove getServerSession() from pages/admin/* files, because it would fail to read env variables if removed

[eddiejaoude]

Thank you for the contribution 👍

I have added some inline comments

[bikrantjajware]

Hello Eddie,
i think the all the comments are addressed now, let me know if you have any more suggestions.

[bikrantjajware]

Hello @eddiejaoude,
just following up on this, do you have any comments :)

[eddiejaoude]

Sorry for my delay, I will have a look soon. It looks like the automated tests are passing which is great 👍

[eddiejaoude]

Thank you 👍

[bikrantjajware]

Thank you Eddie :)