Store creation flow exit improvements

[0nko]

This PR adds some UX improvements for exiting the store creation flow:

1. Tapping on the Back link on the first page of the survey exits the flow
2. Tapping on the back button on the toolbar shows a confirmation dialog

To test:

1. Start the store creation flow
2. Tap on the Back link button on the page
3. Notice the store creation flow is closed
4. Start the store creation flow again
5. Tap on the toolbar back navigation button
6. Notice a confirmation dialog is show
7. Tap OK and notice the creation flow is closed

[codecov-commenter]

Codecov Report

Base: 43.59% // Head: 43.57% // Decreases project coverage by -0.02% ⚠️

Coverage data is based on head (59764b0) compared to base (ee35a8e).
Patch coverage: 0.00% of modified lines in pull request are covered.

❗ Current head 59764b0 differs from pull request most recent head 6eb4201. Consider uploading reports for the commit 6eb4201 to get more accurate results

Additional details and impacted files

@@             Coverage Diff              @@
##              trunk    #7715      +/-   ##
============================================
- Coverage     43.59%   43.57%   -0.03%     
  Complexity     3441     3441              
============================================
  Files           623      623              
  Lines         34970    34989      +19     
  Branches       4537     4537              
============================================
  Hits          15245    15245              
- Misses        18325    18344      +19     
  Partials       1400     1400              

Impacted Files	Coverage Δ
...ecreation/webview/WebViewStoreCreationViewModel.kt	0.00% <0.00%> (ø)

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

☔ View full report at Codecov.
📢 Do you have feedback about the report comment? Let us know in this issue.

[wpmobilebot]

You can test the changes on this Pull Request by downloading an installable build, or scanning this QR code:

[JorgeMucientes]

Thanks for working on this @0nko. It works like a charm 👍🏼

One super minor np I noticed unrelated to these changes is that in line 53 from WebViewStoreCreationScreen you could use a function reference IconButton(onClick = viewModel::onBackPressed) like you did in line 47. You are welcome to ignore it and merge :)

[peril-woocommerce]

	Warnings
⚠️	This PR is assigned to a milestone which is closing in less than 2 days Please, make sure to get it merged by then or assign it to a later expiring milestone

Generated by 🚫 dangerJS