Add option to completely disable warning pop-up on tag errors

We have the option runtimeOptions.segments.userCanIgnoreTagValidation to determine, if the user is able to save a segment with tag errors.

Yet with this set to "Activated" the user will still get a pop-up asking him, if he really wants to save and he can ignore the error.

We should extend this config to have 3 options:

• Saving of segment disabled with tag errors
• Warn - user can actively ignore warning
• Just save segment - no warning on errors

The option should be overwritable on client, import and task level.