Enhance]:Replace-deperacted-OnWillPopScope-with-PopScope

[kareemabdeen]

Description

Now, instead of using the deprecated OnWillPopScope, you can simply use PopScope to achieve the same functionality in a more efficient and future-proof way,
also Refactored save changes Dialog as separated function in the app utils files to be separated from the ui code

Fixes #270

Type of change

Please delete options that are not relevant.

• 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)
• Refactor (does not change functionality, e.g. code style improvements, linting)
• Documentation update

How Has This Been Tested?

with my emulator

Please include screenshots below if applicable.
here is how app functions after the changes had done
https://github.com/AOSSIE-Org/Resonate/assets/118139061/ced336de-b05b-4af5-8386-18b1bd84f220

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• 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
• Any dependent changes have been merged and published in downstream modules
• I have checked my code and corrected any misspellings

Maintainer Checklist

• closes #xxxx (Replace xxxx with the GitHub issue number)
• Tag the PR with the appropriate labels

[kareemabdeen]

@chandansgowda if there's any problem on the branch please let me know

[Aarush-Acharya]

Hey @kareemabdeen, This is good to merge will merge once the PR prior to this are resolved

[Aarush-Acharya]

Hey @kareemabdeen this is already taken care of in #274

[vrundraval24]

Hey, @Aarush-Acharya
It is a duplicate, but the original PR has some conflicts and the contributor is not responding so I am merging this.
I am removing the duplicate tag and also closing the original PR without merging.

Good work @kareemabdeen 🚀