ENG-125708: Added level to dialog with header text

[sghosh-c-eightfold]

SUMMARY:

Issue:

When Dialog was opening at that time the header text is in span tag and not assigned with role: heading & aria-level

Solution:

If header text is present then role: heading aria-level:2 will be added to header text

GITHUB ISSUE (Open Source Contributors)

JIRA TASK (Eightfold Employees Only):

https://eightfoldai.atlassian.net/browse/ENG-125708

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:

Steps To Reproduce:

1. Open the URL - PCS Logged out - Career site
2. Select any of the job and Apply
3. Upload Resume

Modal will open-> inspect the heading text of Modal

Go to URL: https://stage.eightfold.ai/careers?domain=eightfolddemo-indhumathi.com

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.44%. Comparing base (67f85d7) to head (7d59d1d).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #969   +/-   ##
=======================================
  Coverage   84.44%   84.44%           
=======================================
  Files        1103     1103           
  Lines       20560    20561    +1     
  Branches     7780     7781    +1     
=======================================
+ Hits        17361    17362    +1     
  Misses       3111     3111           
  Partials       88       88           

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