builds: add a build->project func to get the project via the jobset

Dependencies

• [2] 2DGIP6L4 Cleanup build serialization
• [*] J5UVLXOK * Start of a basic Catalyst web interface.

Change contents

• edit in src/lib/Hydra/Schema/Result/Builds.pm at line 600
  [2.138]

  [4.6337]
  + sub project {

  + my ($self) = @_;

  + return $self->jobset->project;

  + }

  +