facade: corrupted raw email addresses when they include multiple `@` signs

[MoralCode]

When doing some scripting to correct facade data, I discovered that, in https://github.com/chaoss/augur commit 36aab5b, andrew's email address was set to andrew@root@chaoss.tv, however, Augur, for both the raw and parsed values for committer and author email are andrew@root.

While this likely isnt an issue for cmt_author_email (which should probably conform to at least some expectations of syntax validity), the cmt_author_raw_email value is the same, suggesting the error is happening earlier in the processing.

This was found as a result of trying out libgit2 as a backend for git #3787

[iGufrankhan]

@MoralCode
The issue appears to originate in analyzecommit.py, specifically in the strip_extra_amp() function:

def strip_extra_amp(email: str) -> str:
if email.count('@') > 1:
return email[:email.find('@', email.find('@') + 1)]
return email

i think this logic truncates emails containing multiple @ symbols
Since this transformation is applied before assigning both cmt_author_raw_email and cmt_author_email, it results in loss of the original commit metadata, even for the raw field.

i check my self that code assign value after modifying the email