fix(service): fix working on branches in the core-svc

[Panaetius]

closes #3458

[coveralls]

Pull Request Test Coverage Report for Build 5090884416

• 10 of 26 (38.46%) changed or added relevant lines in 8 files are covered.
• 1556 unchanged lines in 103 files lost coverage.
• Overall coverage decreased (-5.2%) to 80.175%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
renku/ui/service/controllers/templates_read_manifest.py	0	1	0.0%
renku/ui/service/serializers/common.py	6	8	75.0%
renku/ui/service/gateways/gitlab_api_provider.py	0	3	0.0%
renku/ui/service/controllers/api/mixins.py	0	10	0.0%

Files with Coverage Reduction	New Missed Lines	%
renku/command/schema/calamus.py	1	72.58%
renku/core/dataset/providers/external.py	1	79.1%
renku/core/dataset/providers/factory.py	1	80.26%
renku/core/migration/m_0003__1_jsonld.py	1	87.68%
renku/core/util/urls.py	1	74.19%
renku/domain_model/provenance/agent.py	1	81.72%
renku/ui/cli/init.py	1	96.9%
renku/ui/service/entrypoint.py	1	80.65%
renku/ui/service/jobs/queues.py	1	92.59%
renku/ui/service/serializers/cache.py	1	93.84%

Totals
Change from base Build 5079704843:	-5.2%
Covered Lines:	24140
Relevant Lines:	30109

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💛 - Coveralls

[m-alisafaee]

Thanks Ralf! Please see my comment.