fix: Account URL added to Auth URLs, and VariationAttribute connection fixed

[kidunot89]

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What does this implement/fix? Explain your changes.

• Adds accountUrl and accountNonce to the Authorizing URLs option.
• Fixes issues related to auth URLs usage.
• Fixes the simpleProduct's defaultAttributes field.

Does this close any currently open issues?

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Any other comments?

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Where has this been tested?

• WooGraphQL Version: …
• WPGraphQL Version: …
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