SEO Assistant: Add error handling to meta description

[dhasilva]

Fixes #41648

Proposed changes:

• Applies the error handling from the title step to the metadescription step
  Note: It should probably be a hook or something to avoid code duplication, but I think this is premature optimization as we still have to deal with dynamic steps and things could get more complicated.

Other information:

• Have you written new tests for your changes, if applicable?
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Jetpack product discussion

Does this pull request change what data or activity we track or use?

Testing instructions:

Same as #41649, just in the next step

[github-actions]

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[github-actions]

Code Coverage Summary

Coverage changed in 1 file.

File	Coverage	Δ%	Δ Uncovered
projects/plugins/jetpack/extensions/plugins/ai-assistant-plugin/components/seo-assistant/use-meta-description-step.tsx	0/75 (0.00%)	0.00%	21 💔

Full summary · PHP report · JS report

_{Coverage check overridden by I don't care about code coverage for this PR Use this label to ignore the check for insufficient code coveage. .}

[CGastrell]

This worked just fine right out of the box! We'll need to address a collateral thing, but in a follow up is fine

[CGastrell]

LGTM! Renaming those state naming makes sense as well 👍

[dhasilva]

I don't care about code coverage for this PR - New feature in active development, prone to quick changes