fix(dash0): put the invite button in the organization header

[fclairamb]

On the Members and Invitations tabs, the Invite button sat alone on a row below the tabs. It now sits in the Organization page header, above the tabs, and only shows on those two tabs.

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.30%. Comparing base (660deb7) to head (62d66e8).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #601      +/-   ##
==========================================
- Coverage   83.36%   83.30%   -0.06%     
==========================================
  Files        1238     1238              
  Lines      127020   127020              
==========================================
- Hits       105891   105819      -72     
- Misses      21120    21192      +72     
  Partials        9        9              

see 22 files with indirect coverage changes

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