Show password field mask while editing service settings

What does this MR do?

While editing service settings from Project > Settings > Integrations, password field label says Change password while the password input field itself remains blank. This MR adds mask to the field while editing the form.

Screenshots

Inactive Service (without any configuration)

Active service (with configuration present)

Active service (when password change is attempted)

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• [ ] 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 #31510 (closed)