Retain original casing for build name in manual pipeline dropdown

What does this MR do?

• Keep the original casing for the build name
• Don't capitalize the action prefix if there is one for casing constancy

Why was this MR needed?

• Build names where being capitalized, which was inconsistent with other pages where the build name was displayed in it's original casing

Screenshots (if relevant)

Before

After

Does this MR meet the acceptance criteria?

• Changelog entry added
• Documentation created/updated
• API support added
• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

Closes #25946 (closed)