Change GET /tickets to /projects/{project_id}/tickets

[surrealist]

To do:

• Remove get all tickets endpoints GET /tickets
• Create a new one so we can get all tickets only for a given project

GET /api/v1/projects/{project_id}/tickets

Acceptance criteria:

• Return tickets must belong to the given project only

[armshare]

33 Done Krub :tada:

[surrealist]

Thanks, let's check the comments in the PR.