Add a new 'enable' field to the profiler config, controlled by the
DD_PROFILING_ENABLED environment variable. This allows users to
disable profiling even when the Start() function is called.

The enable flag defaults to true, maintaining backwards compatibility.
When set to false, the profiler will not start, providing a simple way
to toggle profiling without code changes.

Update tests to cover the new functionality and add logging for the
new configuration option.

Updated profiler options to automatically enable profiling if the environment variable "DD_PROFILING_ENABLED" is set to "auto". This change delegates the decision to the Datadog admission controller when "auto" is specified.

Implemented a new test to verify that no profiles are received when the profiler is disabled. This helps ensure the profiler respects the DD_PROFILING_ENABLED environment variable.