Fix failing tests on 5.x-dev [no_release]

[lachiebol]

Description

Automated fix for failing tests on 5.x-dev.

• Failing workflow: Plugin Slack Tests
• Failing job(s): UI
• CI run: https://github.com/matomo-org/plugin-Slack/actions/runs/29632741138

Generated by automated-test-fixes.

Issue No

Steps to Replicate the Issue

Checklist

• [✖] Tested locally or on demo2/demo3?
• [✔] New test case added/updated?
• [NA] Are all newly added texts included via translation?
• [NA] Are text sanitized properly? (Eg use of v-text v/s v-html for vue)
• [NA] Version bumped?
• [✔] I have understood, reviewed, and tested all AI outputs before use
• [✔] All AI instructions respect security, IP, and privacy rules
• [NA] Documentation updated?