Account for newlines in commit messages on network graph

What does this MR do?

• Accounts for newlines and return characters in commit messages on the network graph
• Commit tooltip properly sizes to show whitespace for long commit messages

Why was this MR needed?

• Long commit messages where not displaying properly

Screenshots (if relevant)

• see screenshot in #25681 (closed)

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 #25681 (closed) Closes #21086 (closed)