Introduce "clear sample" in entity config to have an explicit null

[TeddyCr]

Describe the bug
On the table profiler config, if the sample config is moved, for example, from 36% to then 100% and we have a sample config set at the profiler level to 10%, then the table will not be sampled at 10% but 100% (since table sample takes precedence).

Expected behavior
If a user wants to clear the sample config set at the table level, the profilerSample attribute should be set to None. We need to introduce a clear button to allow users to explicitly clear the sample config

Version:

• OpenMetadata version: 1.6.x