papercut-fix: perform login on enter button press for basic auth in the login page

[vrajashkr]

What type of PR is this?
papercut-fix

Which issue does this PR fix:
Closes #430

What does this PR do / Why do we need it:
This PR contains the following changes:

1. When a user presses the Enter button in the login page's username or password fields, it performs submit only if both username and password fields have some data in them (neither of them are blank).
2. Adds and modifies unit tests to cover the behavior.
3. Removes props that are not used by the SignIn component from test cases.
4. Fixes a typo in data-testid for the OpenID Divider to avoid an error being shown in the Unit Test runs.

Testing done on this change:
Pressing Enter on a fresh login page:

Pressing Enter on the username field while password is blank:

Pressing Enter on the password field while the username is blank:

Pressing Enter on password field after entering both username and password results in a successful login.

Automation added to e2e:
N/A

Will this break upgrades or downgrades. Has updating a running cluster been tested?:
N/A - this is a UI-only change for the login page.

Does this change require updates to the CNI daemonset config files to work?:
N/A

Does this PR introduce any user-facing change?:
Yes

Users can now hit enter while focused on either the username input field or the password input field to login to Zot.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.00%. Comparing base (9de2337) to head (2a94069).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #434      +/-   ##
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+ Coverage   84.85%   85.00%   +0.15%     
==========================================
  Files          63       63              
  Lines        1941     1961      +20     
  Branches      531      532       +1     
==========================================
+ Hits         1647     1667      +20     
  Misses        284      284              
  Partials       10       10              

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[andaaron]

Hi @raulkele, can you please review this?

[raulkele]

lgtm

[andaaron]

Thanks for the PR!