Migrate /enterprise/group_mentions e2e tests to TypeScript

[mattermod]

Converting following spec files under /integration/enterprise/group_mentions to Typescript

1. group_mentions_permissions_spec.js
2. group_mentions_system_messages_spec.js
3. group_mentions_posts_spec.js

Below is a checklist of items you should be doing to migrate:

1. Rename the files to their associated TypeScript extensions (ie. js to ts)
2. Move over all the types from the declaration (d.ts) files into the matching typescript file, and delete the declaration file (see Support Migration PR link below for reference )

3. Fix any errors generated by the TypeScript compiler.

• Navigate to /e2e/cypress and run npm run check-types to display any errors.

4. Run

/e2e-run from PR and make sure all migrated and existing tests are passed. Automation results can be seen here Automation Dashboard

Note:

• Please update types in the declaration files (d.ts) if they are out of date or mismatch with actual usage.
• Please migrate support files to typescript if the new typescript files depend on them (you will see compilation errors if this is the case)

References

📗 Suport Files Migration Reference

Support Migration PR

📘 Spec File Migration Reference

account_settings/profile tests migration PR

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New contributors please see our Developer's Guide.

JIRA: https://mattermost.atlassian.net/browse/MM-47304

[arcbjorn]

Hi!
I'd love to work on this issue! 🙂

[michelengelen]

Hi @arcbjorn I just assigned this to you. If you need any help feel free to ping me.