[dotnet] Make SlowLoadable component's timeout and wait() protected

[pujagani]

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Description

Fixes #9009.

Motivation and Context

As described in #9009, the changes update the modifier for wait() method to be accessible to the subclasses and provide a getter for the timeout variable for the same.
The clock variable uses the IClock interface, so making it accessible to subclasses does not allow the use of a subclass specific method, hence instead creating and using a local variable copy will suffice as shown in the tests here https://github.com/SeleniumHQ/selenium/blob/trunk/dotnet/test/support/UI/SlowLoadableComponentTest.cs#L147.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• I have read the contributing document.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!

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[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

[jimevans]

I'm going to go ahead and close this PR, as it's not complete (doesn't expose the Clock as requested, and doesn't make the Wait method virtual for overriding in subclasses). Commit 5632da3 already contains the changes needed in this PR.