PXP-2802 feat(usync-emails)

[vpsx]

Q: Mightn't we as well validate actual provided emails including deliverability checks??
A: Not in usersync; if at all, then in useryaml validation

New Features

• In usersync, populate user email iff email is provided in useryaml OR username is an email addr

Breaking Changes

• Usersync will no longer populate user's email field in Fence db with the user's username, UNLESS the username is an email address, in which case previous behavior applies (email field is populated with the username). In other words, nothing should change except in cases where usersync was putting invalid emails into user email fields anyway.

Dependency updates

• Added dependency email_validator v1.1.1

[github-actions]

The style in this PR agrees with black. ✔️

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[coveralls]

Pull Request Test Coverage Report for Build 9089

• 7 of 7 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.03%) to 69.829%

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Totals
Change from base Build 9074:	0.03%
Covered Lines:	5212
Relevant Lines:	7464

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💛 - Coveralls