[SlimFaas] update job name rules

[kosarkazemi]

Autorise the lenght of the job names to be up to 30 characters: functionName.Length > 30

Files :
https://github.com/SlimPlanet/SlimFaas/blob/main/src/SlimFaas/Endpoints/JobScheduleEndpoints.cs
https://github.com/SlimPlanet/SlimFaas/blob/main/src/SlimFaas/Endpoints/JobEndpoints.cs

Do not forget to update unit tests in :
tests/SlimFaas.Tests/Jobs/JobEndpointsTests.cs
tests/SlimFaas.Tests/Jobs/JobScheduleEndpointsTests.cs

[copilot-swe-agent]

The agent encountered an error and was unable to start working on this issue: This may be caused by a repository ruleset violation. See granting bypass permissions for the agent, or please contact support if the issue persists. (Request id: 353A:5F520:4ED667E:3D55D88:69DF9748)