Add custom warning message when leaving creating an SQL question (#34696)

* Update isNavigationAllowed logic to prevent new model creation

* Add simple model creation test

* Remove identifier

* Update comment

* Add a test case for saving a new model

* Avoid using fetchMock directly in QueryBuilder unit tests

* Remove setupCollectionsEndpointsByIds in favor of setupCollectionByIdEndpoint

* Add native question test base

* Update isNavigationAllowed tests

* Make isNavigationAllowed tests pass

* Update shouldShowUnsavedChangesWarningForSqlQuery logic to account for new questions

* Add a test case to run new native question

* Update mock to include individual collection GET endpoint

* Add DataSourceSelectors to MockNativeQueryEditor

* Update test beforeunload event to reflect new behavior

* Use setupCollectionByIdEndpoint instead of modifying setupCollectionsEndpoints

* Update failing test

* Use serializeCardForUrl

* Add a test for native query editing

* Do not trigger warning when leaving empty question

* Add beforeunload tests for creating new questions

* Remove redundant div

* Make assertions consistent

* Use single resetAllMocks()

* Fix post-rebase conflict

* Work around Cypress not handling beforeunload-related prompts

* Our app registers beforeunload event listener e.g. when editing a native SQL question.
* Cypress does not automatically close the browser prompt and does not allow manually
* interacting with it (unlike with window.confirm). The test will hang forever with
* the prompt displayed and will eventually time out. We need to work around this by
* monkey-patching window.addEventListener to ignore beforeunload event handlers.
*
* @see https://github.com/cypress-io/cypress/issues/2118