Changes to List practice groups

for the path request parameter workspaceSlug, the minLength was increased from 0 to 3

for the path request parameter workspaceSlug, the maxLength was set to 51

changed the pattern of the path request parameter workspaceSlug from ^[a-z0-9][a-z0-9-]{2,50}$ to ^(?!.*--)[a-z0-9][a-z0-9-]{1,49}[a-z0-9]$