[Bug] Add condition for handling arrays of discriminators

[sserrata]

Description

• Adds support for items.anyOf and items.oneOf
• Adds missing return statement in createProperties that would have prevented properties from rendering in some cases

Additional Changes

• Adds missing --openapi-input-background variable to styles.css (see <option> elements do not have background color defined #342)
• Matches discriminator tab styles to schema tab styles for consistency

Motivation and Context

Addresses #343

How Has This Been Tested?

Tested with OpenAPI snippet shared in #343

Screenshots (if appropriate)

See deploy preview and #343

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

[github-actions]

Size Change: -242 B (0%)

Total Size: 4.17 MB

Filename	Size	Change
demo/build/assets/css/styles.********.css	108 kB	-242 B (0%)

ℹ️ View Unchanged

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demo/build/assets/js/runtime~main.********.js	8.95 kB
demo/build/index.html	89.3 kB

_{compressed-size-action}

[github-actions]

Visit the preview URL for this PR (updated for commit 7567661):

https://docusaurus-openapi-36b86--pr344-1c3kvxma.web.app

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