Improve Create New checkbox handling in CreateWorkspace page object

[SkorikSergey]

What does this PR do?

The "Create New" checkbox in the CreateWorkspace page had several reliability issues:

1. Checkbox not visible: The checkbox is located at the bottom of the page and sometimes not visible, causing click failures
2. State change timing: When entering a Git repository URL, the checkbox automatically changes state, but this takes variable time

Solution

• Added waitForCheckboxState() method - polls every 500ms until checkbox reaches expected state (checked/unchecked), with configurable timeout
• Added scroll before click - both clickOnCreateNewWorkspaceCheckbox() and setCreateNewWorkspaceCheckbox() now use scrollToAndClick() to ensure the checkbox is visible before clicking
• Used polling in setCreateNewWorkspaceCheckbox() - after clicking, waits for checkbox to reach the expected state using the new polling method

Screenshot/screencast of this PR

What issues does this PR fix or reference?

https://issues.redhat.com/browse/CRW-10403

How to test this PR?

PR Checklist

As the author of this Pull Request I made sure that:

• The Eclipse Contributor Agreement is valid
• Code produced is complete
• Code builds without errors
• Tests are covering the bugfix or new feature
• The repository devfile is up to date and works
• Sections What issues does this PR fix or reference and How to test this PR completed
• Relevant user documentation updated
• Relevant contributing documentation updated
• CI/CD changes implemented, documented and communicated

Reviewers

Reviewers, please comment how you tested the PR when approving it.

[dmytro-ndp]

LGTM