Fix error tracking table layout on small screens

What does this MR do?

#26121 (closed)

1. Truncate error text, always limit to one line
2. Remove duplicate title/description info
3. Prevent external link icon from shrinking
4. Remove calendar icon from 'Last seen' column to save space
5. Switch to stacked mode on tiny screens

Screenshots

regular table	stacked table

Testing

1. Login to https://sentry.gitlab.net/ and get API key
2. Enable Error Tracking in Settings > Operations > Error Tracking
3. set URL: https://sentry.gitlab.net/ , Auth token to API key, and choose a project (e.g. sentry-testing)
4. Go to Operations > Error tracking and resize page until something breaks

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Tested in all supported browsers