[enriched/git] Fix 'is_git_commit_multi_author' field.

[zhquan]

This fixes the is_git_commit_multi_author field when the commit has more than one author and pair-programming is enabled. This is important for calculating pair_programming_* values.

Also, set git_uuid correctly.

Signed-off-by: Quan Zhou quan@bitergia.com

[coveralls]

Pull Request Test Coverage Report for Build 2346733831

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 5 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.02%) to 81.96%

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Files with Coverage Reduction	New Missed Lines	%
/home/runner/work/grimoirelab-elk/grimoirelab-elk/grimoire_elk/enriched/github.py	2	75.31%
/home/runner/work/grimoirelab-elk/grimoirelab-elk/grimoire_elk/enriched/git.py	3	71.84%
<!--	Total:	5		-->

Totals
Change from base Build 2346671797:	-0.02%
Covered Lines:	8782
Relevant Lines:	10715

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💛 - Coveralls

[jjmerchante]

LGTM