ENG-162487: accessibility fix for stepper component to move the focus to the selected section

[ssherigar-c-eightfold]

SUMMARY:

ENG-162487:
Links should direct keyboard users to the relevant form section by either linking to the section heading or setting focus on the first input field.
Solution:
When the Enter or Space key is pressed on a link, the page smoothly scrolls to the corresponding form section and automatically sets focus on the first input field, enabling immediate keyboard interaction

GITHUB ISSUE (Open Source Contributors)

NA

JIRA TASK (Eightfold Employees Only):

https://eightfoldai.atlassian.net/browse/ENG-162487

CHANGE TYPE:

• Bugfix Pull Request
• Feature Pull Request

TEST COVERAGE:

• Tests for this change already exist
• I have added unittests for this change

TEST PLAN:

Navigate to TA Home → My Positions → Create Position → Create from Scratch → Select Template
Try to fill the form using keyboard for different section

Expected Result:
When a keyboard user activates a link using the Enter or Space key, the page scrolls smoothly to the targeted form section, and the first input field in that section receives focus, allowing the user to start interacting with the form immediately without additional navigation

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