TUI fixes + rsync log

[tieneupin]

The client-side TUI was requesting for the machine config using a server API endpoint that relied on the server having a pre-defined BEAMLINE environment variable, which is something we're moving away from. This PR replaces those endpoint requests with the one that loads the machine config that matches the client's instrument name.

Also fixes minor broken logic prevent the visit creation screen from working, and adds a log to report on the rsync remote path being used.

Verification checks:

• Simulated CLEM session ran successfully through to completion, with processing being triggered correctly.

[codecov]

Codecov Report

Attention: Patch coverage is 22.22222% with 7 lines in your changes missing coverage. Please review.

Project coverage is 27.40%. Comparing base (32f8ef7) to head (84b8742).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #477      +/-   ##
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+ Coverage   27.39%   27.40%   +0.01%     
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  Files          78       78              
  Lines       10138    10140       +2     
  Branches     1333     1332       -1     
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+ Hits         2777     2779       +2     
  Misses       7266     7266              
  Partials       95       95