Feature/tet 812 add stova service tag

[DeanElliott96]

Description of change

Add a new event service tag for a new Stova Event Service service. Without it, there is an empty tag shown.
Also fixes a console warning for an invalid prop value.

This is required to be merged and released before: uktrade/data-hub-api#5866

Test instructions

The existing service tags allowing the new (to be released) Stova Event Service to be shown.

Screenshots

Before

After

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 #58281

Run Properties:   Passed #58281  •  56a1bca134: Use the TAG_COLOURS constant instead of strings

Project	data-hub-frontend
Branch Review	feature/TET-812-add-stova-service-tag
Run status	Passed #58281
Run duration	08m 29s
Commit	56a1bca134: Use the TAG_COLOURS constant instead of strings
Committer	Dean Elliott
View all properties for this run ↗︎

---

Test results
Failures	0
Flaky	0
Pending	4
Skipped	0
Passing	75
View all changes introduced in this branch ↗︎

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.62%. Comparing base (6d45f0e) to head (56a1bca).
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7422      +/-   ##
==========================================
+ Coverage   88.61%   88.62%   +0.01%     
==========================================
  Files        1161     1161              
  Lines       18022    18024       +2     
  Branches     5124     5126       +2     
==========================================
+ Hits        15970    15974       +4     
+ Misses       2052     2050       -2     

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