feat(gatsby-plugin-sass): Enable url() resolution for modules

[Js-Brecht]

Description

Duplicates the logic for including resolve-url-loader in sassRule into sassRuleModule. The lack of resolve-url-loader in sass modules was causing issues when @importing from, for example, a global reference *.scss file into a *.module.scss file. url()'s were not being resolved relative to the declaration.

Related Issues

Addresses issue #16361

[sidharthachatterjee]

Looks good! Thank you for fixing this

[gatsbot]

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