Pop up confirmation prompt on the Shipping page before saving changes

[eason9487]

Changes proposed in this Pull Request:

Project thread: pcTzPl-2Cf-p2

This PR implements the 📌 Add popup when saving task of the project.

💡 Update for src/Tracking/README.md will be done by the conjunction PR for the feature branch.

Screenshots:

Kapture.2025-01-09.at.17.47.14.mp4

Detailed test instructions:

1. Go to step 2 of the onboarding flow
   • Check if clicking the "Continue" button can go to the next step without confirmation prompt
2. Go to the Shipping page
   • Check if clicking the "Save changes" button can pop up confirmation prompt
   • Click the "Don't save" button to see if it dismisses the save
   • Click the "Save changes" button to pop up confirmation prompt again
   • Click the "Continue to save" button to see if it continues saving
3. View the E2E testing result: https://github.com/woocommerce/google-listings-and-ads/actions/runs/12687425268

Changelog entry

Tweak - Pop up confirmation prompt on the Shipping page before saving changes.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.7%. Comparing base (6a2b8e4) to head (c530806).
Report is 5 commits behind head on feature/shipping-improvements.

Additional details and impacted files

@@                        Coverage Diff                         @@
##             feature/shipping-improvements   #2756      +/-   ##
==================================================================
- Coverage                             67.0%   66.7%    -0.3%     
==================================================================
  Files                                  796     316     -480     
  Lines                                24522    4922   -19600     
  Branches                              1204    1204              
==================================================================
- Hits                                 16423    3282   -13141     
+ Misses                                7962    1503    -6459     
  Partials                               137     137              

Flag	Coverage Δ
js-unit-tests	66.7% <ø> (ø)
php-unit-tests	?

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see 480 files with indirect coverage changes

[puntope]

LGTM ✅

The modal works as expected. Thanks