Log a fixed text and the exception class instead of the provider's error message

Problem/Motivation

A provider failure logs the provider's error message. That message can include part of the API key: OpenAI echoes a wrong key, and a masked form of a real one.

Steps to reproduce

1. Set a wrong API key on the provider.
2. Generate an image.
3. Read the ai_media entry in Recent log messages.

Proposed resolution

Log a fixed text with the operation and the exception class, without the provider message.

Before (1.0.x): the ai_media entry in Recent log messages carries the provider's text, with the key (a fake test key here).

After: the entry names the operation and the exception class only.

Remaining tasks

• ✅ File an issue
• ❌ Addition/Change/Update/Fix
• ❌ Testing to ensure no regression
• ➖ Automated unit/functional testing coverage
• ➖ Developer Documentation support
• ➖ User Guide Documentation support
• ➖ UX/UI designer responsibilities
• ➖ Accessibility and Readability
• ❌ Reviewed by a human
• ❌ Code review by maintainers
• ❌ Full testing and approval
• ❌ Credit contributors
• ❌ Review with the product owner
• ✅ Update Release Notes
• ✅ Release

User interface changes

• N/A

API changes

• N/A

Data model changes

• N/A

Release notes snippet

• N/A

AI-Generated: Yes