feat: modify PhoneNumberSerializer regex to allow plus symbol at the …

[andrey-canon]

Description

This modifies the current serializer regex that removes all characters that are not numbers, to allow the plus symbol at the start, This modification is made based on this comment

Testing instructions

import re

data = "+57+26100*4-8"
re.sub(r'(?!^)\+|[^0-9+]', "", data) # Expected result  "+572610048"

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[justinhynes]

Hi there! Thanks for your contribution. Is there any chance you could update the unit tests with this change as well?

Specifically, I'm thinking we should update the test_phone_number_can_only_contain_digits unittest. We should probably update the name (since a non-numerical digit will now be accepted).

[justinhynes]

Please see my comment -- I'm requesting a tiny update to existing unit tests before accepting this change! :)

[justinhynes]

LGTM, and thanks for reworking the old unit tests. These are much cleaner and easier to read.

I'll go ahead and merge this too.

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2U Release Notice: This PR has been deployed to the edX staging environment in preparation for a release to production.

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2U Release Notice: This PR has been deployed to the edX production environment.

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2U Release Notice: This PR has been deployed to the edX production environment.