PM-14179: Update generator screen copy button

[david-livefront]

🎟️ Tracking

PM-14179

📔 Objective

This PR moves the password copy button down and make it more pronounces as well as updates the BitwardenTextField to allow for nullable labels.

📸 Screenshots

Before	After

⏰ Reminders before review

• Contributor guidelines followed
• All formatters and local linters executed and passed
• Written new unit and / or integration tests where applicable
• Used internationalization (i18n) for all UI strings
• CI builds passed
• Communicated to DevOps any deployment requirements
• Updated any necessary documentation or informed the documentation team

🦮 Reviewer guidelines

• 👍 (:+1:) or similar for great changes
• 📝 (:memo:) or ℹ️ (:information_source:) for notes or general info
• ❓ (:question:) for questions
• 🤔 (:thinking:) or 💭 (:thought_balloon:) for more open inquiry that's not quite a confirmed
  issue and could potentially benefit from discussion
• 🎨 (:art:) for suggestions / improvements
• ❌ (:x:) or ⚠️ (:warning:) for more significant problems or concerns needing attention
• 🌱 (:seedling:) or ♻️ (:recycle:) for future improvements or indications of technical debt
• ⛏ (:pick:) for minor or nitpick changes

[github-actions]

Checkmarx One – Scan Summary & Details – 119d73be-fd7c-44a7-af1b-a367c0f39203

No New Or Fixed Issues Found

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.86%. Comparing base (9c2a902) to head (08c87ee).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4530   +/-   ##
=======================================
  Coverage   88.86%   88.86%           
=======================================
  Files         460      460           
  Lines       39912    39917    +5     
  Branches     5690     5690           
=======================================
+ Hits        35468    35474    +6     
+ Misses       2458     2457    -1     
  Partials     1986     1986           

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[david-livefront]

Thanks @SaintPatrck