Feature/CLS2-1039 Test that email is displayed correctly on EYB lead details page

[swenban]

Description of change

This PR adds a row to the table on the EYB lead details page to display the contact email address for the lead.
If no email is present, the text Not set will be displayed

Document what the PR does and why the change is needed

Test instructions

1. Visit the details page for an EYB lead that has an email address
   Check that the email address is displayed in the Email row

2. Visit the details page for an EYB lead with no email address
   Check that the text 'Not set' is displayed in the Email row

Checklist

• Has the branch been rebased to main?
• Automated tests (Any of the following when applicable: Unit, Functional or End-to-End)
• Manual compatibility testing (Browsers: Chrome, Firefox, Edge, Safari)

[cypress]

data-hub-frontend    Run #58344

Run Properties:   Passed #58344  •  6ffd4e08d6: Test that email is displayed correctly on eyb lead details page

Project	data-hub-frontend
Branch Review	feature/CLS2-1039-display-email-on-eyb-lead-details-page
Run status	Passed #58344
Run duration	01m 38s
Commit	6ffd4e08d6: Test that email is displayed correctly on eyb lead details page
Committer	Sophie Wenban
View all properties for this run ↗︎

---

Test results
Failures	0
Flaky	0
Pending	0
Skipped	0
Passing	15
View all changes introduced in this branch ↗︎

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.60%. Comparing base (3170151) to head (6ffd4e0).
Report is 41 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7436   +/-   ##
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  Coverage   88.60%   88.60%           
=======================================
  Files        1159     1159           
  Lines       18025    18026    +1     
  Branches     5128     5129    +1     
=======================================
+ Hits        15971    15972    +1     
  Misses       2054     2054           

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