Remove old wait method

What does this MR do?

• Renames wait to wait_until and updates parameters (the code was refactored in !21804 (merged))
• Simplifies a few cases where wait was unnecessary because it had reload: false and therefore was no different than using Capybara's built in wait: parameter.

Part of gitlab-qa#282 (closed) and #39208 (closed)

Does this MR meet the acceptance criteria?

Conformity

• [-] Changelog entry
• [-] Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• [-] Database guides
• [-] Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• [-] Tested in all supported browsers