Skip Comment Moderation Analysis if marked as spam/trash

[Intenzi]

What?

Follow up to #516 (comment)

This PR enables skipping of comment moderation AI analysis when comment is flagged as spam/trash by WordPress moderation/external plugins.

Why?

We should avoid token usage and sentiment analysis when a comment has been flagged to be spam by auto moderation beforehand.

How?

Adds a check in moderate_comment() function to validate comment_approved status.
Skips comment analysis when comment approval status is spam/trash

Use of AI Tools

AI assistance: Yes
Tool(s): Antigravity IDE
Model(s): Gemini 3.5 Flash (Low)
Used for: Creating the boilerplate of the integration test. Reviewed and modified by me to function properly.

Testing Instructions

1. Enable Comment Moderation experiment.

For spam testing:

• Install Akismet Anti-spam: Spam protection plugin.
• Enter valid API key to enable the plugin.
• Comment on a post with akismet-guaranteed-spam
• Go to comments list in admin, verify that it is flagged as spam and check sentiment, toxicity analysis to be empty.

For trash testing:

• Go to WordPress settings -> Discussion
• Scroll down to Disallowed Comment Keys and add trash as a keyword.
• Save settings.
• Comment a post with trash word.
• Go to comments list in admin, verify that it is flagged as trash and check sentiment, toxicity analysis to be empty.

Screenshots or screencast

Visible empty sentiment, toxicity analysis.

Changelog Entry

Changed - moderate_comment() function to skip comment analysis and moderation when comment is flagged as spam/trash.

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Co-authored-by: Intenzi <intenzi@git.wordpress.org>

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[speedyprem]

LGTM 👍