Fix api-key comment not updating

[Nihad74]

Description

Fixes API key comments not updating immediately in the UI after being changed.

The API response for API keys without a comment does not include the comment property. Since the frontend uses Vue 2, assigning the property directly later does not make it reactive. This change uses this.$set when updating the API key comment so the UI is updated immediately.

Addressed Issue

Fixes #1225

Additional Details

The original fix for v4 normalized missing API key comments to an empty string in multiple places.

For v5, the issue can be fixed more minimally at the point where the comment is updated:

this.$set(this.apiKey, 'comment', response.data.comment);

This ensures that the comment property is reactive even when it was not present on the API key object initially.
Tested manually with:

• API key without an existing comment
• API key with an existing comment
• Clearing an existing comment
• Newly created API key

Checklist

• I have read and understand the contributing guidelines
• This PR introduces new or alters existing behavior, and I have updated the documentation accordingly -> this is a small bug fix ; no need to update documentation

[owasp-dt-bot]

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