Add sign in to customers portal
What does this MR do and why?
Adds the two methods of signing in to Customers Portal.
Additionally exchanged Log in with Sign in as this is what we refer to on https://customers.gitlab.com
Screenshots or screen recordings
Sign in through GitLab.com account:
1.
1. 
Sign in through legacy sign in (email and password):
1.
1. 
1. 
How to set up and validate locally
You can test on https://customers.gitlab.com/
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Edited by Manuel Gass