BC-5268 change alert api to v3

[wiaderwek]

Description

QA note:
Change tested on env:
https://bc-5268-move-alert-to-nest.dbc.dbildungscloud.dev/
https://bc-5268-move-alert-to-nest.nbc.dbildungscloud.dev/
https://bc-5268-move-alert-to-nest.brb.dbildungscloud.dev/
No issues found. Tested for all users, everything works as on the main.
See ticket: https://ticketsystem.dbildungscloud.de/browse/BC-5268

Links to Tickets or other pull requests

https://ticketsystem.dbildungscloud.de/browse/BC-5268
hpi-schul-cloud/schulcloud-server#4929
hpi-schul-cloud/nuxt-client#3205

Changes

Data Security

Deployment

New Repos, NPM packages or vendor scripts

Screenshots of UI changes

Approval for review

• QA: In addition to review, the code has been manually tested (if manual testing is possible)
• All points were discussed with the ticket creator, support-team or product owner. The code upholds all quality guidelines from the PR-template.
• DEV: Every new component is implemented having accessibility in mind (e.g. aria-label, role property)

Notice: Please remove the WIP label if the PR is ready to review, otherwise nobody will review it.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud