add tldraw application level metrics

[wiaderwek]

Description

QA note:
change tested on env:
https://bc-6059-tldraw-application-metrics.brb.dbildungscloud.dev/rooms/659d0c78bff8d8a6c77f330c/board
and grafana
https://grafana.dbildungscloud.dev/d/b7dd7ec2-10a1-4971-9d8a-4d55581f4d7c/devops-tldraw?orgId=1&refresh=1m
The first 2 metrics are implemented:
how many Tldraw's boards are there; - no issues found
how many users are using the Tldraw's; - no issues found
the third:
what's the average number of users present in a Tldraw's board. - is excluded from the implementation
more see - https://ticketsystem.dbildungscloud.de/browse/BC-6059

Links to Tickets or other pull requests

https://ticketsystem.dbildungscloud.de/browse/BC-6059

Changes

Datasecurity

Deployment

New Repos, NPM pakages or vendor scripts

Approval for review

• DEV: If api was changed - generate-client:server was executed in vue frontend and changes were tested and put in a PR with the same branch name.
• 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.

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

[sonarqubecloud]

Quality Gate passed

Kudos, no new issues were introduced!

0 New issues
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud