chore: release v2.7.0

[olevski]

Finalizing 2.7.0 release

Note target branch is master

[coveralls]

Pull Request Test Coverage Report for Build 6326883683

• 109 of 120 (90.83%) changed or added relevant lines in 24 files are covered.
• 68 unchanged lines in 13 files lost coverage.
• Overall coverage increased (+1.0%) to 86.78%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
renku/infrastructure/git_merger.py	0	1	0.0%
renku/ui/service/controllers/api/mixins.py	15	17	88.24%
renku/ui/service/utils/init.py	14	16	87.5%
renku/command/checks/workflow.py	17	20	85.0%
renku/ui/service/serializers/workflows.py	13	16	81.25%

Files with Coverage Reduction	New Missed Lines	%
renku/core/util/requests.py	1	94.69%
renku/core/util/tabulate.py	1	96.3%
renku/ui/service/cache/models/file.py	1	93.15%
renku/ui/service/errors.py	1	81.95%
renku/core/util/os.py	2	88.38%
renku/ui/service/jobs/cleanup.py	2	80.65%
renku/core/dataset/dataset.py	3	85.31%
renku/ui/service/controllers/cache_migrations_check.py	3	89.83%
renku/command/checks/datasets.py	5	81.65%
renku/core/util/git.py	5	85.66%

Totals
Change from base Build 5819030350:	1.0%
Covered Lines:	26171
Relevant Lines:	30158

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💛 - Coveralls