[forwardport] Admin user auth controller refactor

[AnshuMishra17]

Original Pull Request

#16560

Description
Refactor the code by removing the direct use of ObjectManager and includes the dependencies using Constructor Dependency Injection

Manual testing scenarios

1. Created a new admin user
2. Login and logout using new admin user
3. Clicked on forgot password and provided new admin user email id.
4. Clicked on reset password link in email.
5. Created new password from reset password page.
6. Login using new password.

[magento-engcom-team]

Hi @AnshuMishra17. Thank you for your contribution
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[AnshuMishra17]

@arnoudhgz I have created new PR for changes done under #16560

[arnoudhgz]

@AnshuMishra17 I think you are almost there, please solve the issues found with the Codacy and TravisCI automated checks.

At the moment the TravisCI check TEST_SUITE=integration INTEGRATION_INDEX=2 will fail because of a timeout. This is not resolvable at the moment I think.

The other checks you can probably resolve.

[AnshuMishra17]

@arnoudhgz I can see following issues that I am not sure how to rectify.
It would be nice if you can take a look and guide me with correct steps to fix the issues.

1. The property $_userFactory is not named in camelCase.
   How to change this?
2. Avoid using static access to class '\Zend_Validate' in method 'execute'.
   What is the recommended way to fix this?
3. Avoid excessively long variable names like $userCollectionFactory. Keep variable name length under 20.
   What should be the variable name here, according to Magento coding standards?

[ihor-sviziev]

@AnshuMishra17 ping me in Slack, I'll help you to finalize both PRs.

[ihor-sviziev]

Hi @AnshuMishra17,
Unfortunately due to mistake and not full list of changes from original PR @sidolov merged forwardport PR from another author #17140. Sorry for that.
I'm closing this PR as not relevant anymore