test(searchbar): break up screenshot test

[liamdebeasi]

Pull request checklist

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)
  • Some docs updates need to be made in the ionic-docs repo, in a separate PR. See the contributing guide for details.
• Build (npm run build) was run locally and any changes were pushed
• Lint (npm run lint) has passed locally and any fixes were made for failures

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

What is the current behavior?

The searchbar screenshot test is flaky due to the rendering of an animated searchbar at the bottom of the screenshot.

What is the new behavior?

• Broke the screenshot test up into several smaller screenshots to a) de-duplicate tests, b) reduce screenshot size, and c) improve stability of tests to avoid async rendering (such as with the animated searchbar).

Does this introduce a breaking change?

• Yes
• No

Other information

[averyjohnston]

There's a list screenshot update that snuck in, but otherwise this LGTM.

[liamdebeasi]

Good catch! Fixing that in #26458.