Disable shadow filtering : very high quality and clean distortion code

[sebastienlagarde]

Purpose of this PR

This PR disable vrey high quality filtering mode for shadow in UI as it is not implemented
(original PR adding it are:
#4344
#4482
and
#4485
)
Waiting for #4037

This PR also clean distortion code in lit shader. The code in LitProperties was causing issue with Hybrid renderer

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Testing status

Describe what manual/automated tests were performed for this PR

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Comments to reviewers

Notes for the reviewers you have assigned.

[github-actions]

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[alex-vazquez]

If you want to disable the entry maybe is better to do it this way:

Suggested change

	// TEMP: HDShadowFilteringQuality.VeryHigh - This filtering mode is not ready so disabling in UI
	// To re-enable remove the wo following light and re-enable the third one
	int value = EditorGUILayout.IntPopup(Styles.filteringQuality, serialized.renderPipelineSettings.hdShadowInitParams.shadowFilteringQuality.enumValueIndex, Styles.shadowFilteringNames, Styles.shadowFilteringValue);
	serialized.renderPipelineSettings.hdShadowInitParams.shadowFilteringQuality.enumValueIndex = value;
	//EditorGUILayout.PropertyField(serialized.renderPipelineSettings.hdShadowInitParams.shadowFilteringQuality, Styles.filteringQuality);
	serialized.renderPipelineSettings.hdShadowInitParams.shadowFilteringQuality.intValue = (int)(HDShadowFilteringQuality)EditorGUILayout.EnumPopup(
	Styles.filteringQuality,
	(HDShadowFilteringQuality)serialized.renderPipelineSettings.hdShadowInitParams.shadowFilteringQuality.intValue,
	e => (HDShadowFilteringQuality)e != HDShadowFilteringQuality.VeryHigh, /* TEMP: HDShadowFilteringQuality.VeryHigh - This filtering mode is not ready so disabling in UI */
	false);

It will still be visible, but users won't be able to select it from the UI, Also you do not need the GUIContents

[sebastienlagarde]

Thanks for the suggestion and it is what I wanted to do initially but don't know how, so good. But it is preferable to hide it fully, otherwise we will get various question about how to enable it. i.e users will think there is a settings somewhere to enable it whereas the feature is not implemented at all...