BC-6461 refactor tldraw redis logic

[wiaderwek]

Description

QA note:
Change tested your on env:
https://bc-6461-refactor-redis-logic.nbc.dbildungscloud.dev/
Tested tldraw by checking it works, Used 3 accounts teacher ,substitute teacher, student. Tested saving and upload files. Basic functions like copying writing drawing checked. No issues found.

Links to Tickets or other pull requests

https://ticketsystem.dbildungscloud.de/browse/BC-6461

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

Issues
0 New issues
0 Accepted issues

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

See analysis details on SonarCloud