linux key escrow progress windows

[mostlikelee]

#24013

Adding progress windows to key escrow process during passphrase validation and key escrow. Because of how we launch user processes as root (execuser.Run), to kill a progress window (runs until killed) we cannot simply cancel the context or cmd.Process.Kill(). This PR takes a brute force approach by killing all zenity processes. Also attempted limiting the kill scope by only killing child processes of orbit, but the zenity user process does not show up as a child process after launched. ps aux shows 2 zenity processes: 1 as sudo, the other as a zenity process in user space.

Also included are some bug and copy fixes to the user prompts.

• Changes file added for user-visible changes in changes/, orbit/changes/ or ee/fleetd-chrome/changes.
  See Changes files for more information.
• Added/updated tests
• Manual QA for all new/changed functionality
• For Orbit and Fleet Desktop changes:
  • Orbit runs on macOS, Linux and Windows. Check if the orbit feature/bugfix should only apply to one platform (runtime.GOOS).
  • Manual QA must be performed in the three main OSs, macOS, Windows and Linux.
  • Auto-update manual QA, from released version of component to new version (see tools/tuf/test).

[codecov]

Codecov Report

Attention: Patch coverage is 11.59420% with 61 lines in your changes missing coverage. Please review.

Project coverage is 63.39%. Comparing base (a8ba004) to head (c6267a9).
Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
orbit/pkg/luks/luks_linux.go	0.00%	46 Missing ⚠️
orbit/pkg/zenity/zenity.go	42.10%	11 Missing ⚠️
orbit/pkg/execuser/execuser_linux.go	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #24069      +/-   ##
==========================================
- Coverage   63.40%   63.39%   -0.02%     
==========================================
  Files        1579     1579              
  Lines      150006   150038      +32     
  Branches     3818     3818              
==========================================
+ Hits        95112    95114       +2     
- Misses      47309    47338      +29     
- Partials     7585     7586       +1     

Flag	Coverage Δ
backend	64.25% <11.59%> (-0.02%)	⬇️

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