Maya: make render settings validator optional

[antirotor]

Changelog Description

Make Render Settings validator otional

Testing notes:

1. set render settings validator in Maya optional
2. try to publish render

[moonyuet]

I also find out the enabled option for ValidatePluginPathAttributesModel might be wrong.(not related to this PR)

ayon-core/server_addon/maya/server/settings/publishers.py

Lines 239 to 246 in 9f4c701

	class ValidatePluginPathAttributesModel(BaseSettingsModel):
	"""Fill in the node types and attributes you want to validate.
	<p>e.g. <b>AlembicNode.abc_file</b>, the node type is <b>AlembicNode</b>
	and the node attribute is <b>abc_file</b>
	"""
	enabled: bool = True

[antirotor]

I also find out the enabled option for ValidatePluginPathAttributesModel might be wrong.(not related to this PR)

Unrelated, but fixed it here anyway, sorry about that.

[moonyuet]

Tested successfully in Maya, one remark is that it would be great to have more concise label for the validator such as Validate Render Setting so that users know what the validator is enabled for the render instance when they are at the publish tab.

ayon-core/client/ayon_core/hosts/maya/plugins/publish/validate_rendersettings.py

Line 72 in b87e904

label = "Render Settings"

[LiborBatek]

All works as expected...

I have located the Validator and set it as Optional and it was available in the publisher UI and when my settings been wrong it correctly validated when enabled and vice versa....