chore: use fully-qualified class names for PHPDoc types

[justlevine]

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What does this implement/fix? Explain your changes.

This PR fixes all existing PHPDoc types to use full-qualified class-names.

PHPDoc does not infer a class from the use statements, so using FQCN is required to ensure that devs can properly extend this plugin (and get the correct type hints/ stan checks)

Branch is based off of #763, which should be merged first.

Does this close any currently open issues?

…

Any relevant logs, error output, GraphiQL screenshots, etc?

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Any other comments?

Audited with WPGraphQL Coding Standards.

Where has this been tested?

• WooGraphQL Version: 0.14.1
• WPGraphQL Version: 1.14.6
• WordPress Version: 6.2.2
• WooCommerce Version: 7.8.2

[kidunot89]

Looks good