test(angular): remove routing waits in tests

[liamdebeasi]

Issue number: N/A

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What is the current behavior?

Our Angular E2E tests are brittle because they rely on arbitrary cy.wait calls to account for asynchronous routing. This leads to flaky tests on CI and seemingly random test failures when we make adjustments to the Ionic Anguar routing integration (see: #28188)

Additionally, our test execution for the navigation tests is quite slow because transitions are enabled. As a result, we need to wait hundreds of ms per test just for the transitions to finish.

What is the new behavior?

• Updated the testStack command to use a new getStack Cypress query. These queries come with automatic retrying built-in. By leveraging this query in the testStack command, we can avoid the arbitrary waits.
• Added ionic:_testing=true query strings to the navigation tests. This causes Ionic to disable any transitions so the tests execute faster.
• Removed most of the arbitrary cy.wait calls. I kept the swipe to go back cy.wait -- I wasn't quite sure how to reduce flakiness on that one.

Does this introduce a breaking change?

• Yes
• No

Other information

[sean-perkins]

I think it's a good call leaving the wait for the swipe to go back.