Trim email address in customer account create and login form

[dankhrapiyush]

Related to issue: #6058

Description

Trim email address by remove leading or trailing space on following forms.

• Customer account login page (Improved PR code Trim username on customer account login page #15365)
• Customer account create page
• Customer authentication popup in case Allow Guest Checkout set to No

Fixed Issues (if relevant)

1. IE11 user login email validation fails if field has leading or trailing space #6058: IE11 user login email validation fails if field has leading or trailing space

Manual testing scenarios

1. Open customer account login page in Firefox or IE browser.
2. Try to add space before entering an email address in the Email field.
3. Copy " johndoe@domain.com " and paste in the Email field. It will automatically remove leading or trailing space.
4. Check same on customer account create page
5. Check same on customer authentication popup. To check this, set Store > Configuration > Sales > Checkout > Checkout Options > Allow Guest Checkout to No. Add product to cart and click on Proceed to Checkout button in the cart page or top mini cart.

Contribution checklist

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds on Travis CI are green)

[magento-engcom-team]

Hi @dankhrapiyush. Thank you for your contribution
Here is some useful tips how you can test your changes using Magento test environment.
Add the comment under your pull request to deploy test or vanilla Magento instance:

• @magento-engcom-team give me test instance - deploy test instance based on Pull Request changes
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[VladimirZaets]

Hi, @dankhrapiyush, thank you for collaboration, I took your PR into the processing

[magento-engcom-team]

Hi @dankhrapiyush. Thank you for your contribution.
Changes from your Pull Request will be available with the upcoming 2.2.6 release.

Please, consider to port this solution to 2.3 release line.
You may use Porting tool to port commits automatically.