Added 'PAUSED' to progress bar text when measurement script paused

[dc2917]

Description

This PR contains an update to the measure script dialog window, such that when the script is paused, the progress bar text changes from xy% to PAUSED (xy%), and back to xy% when unpaused.

This is achieved by updating the format attribute of the associated QProgressBar, rather than explicitly changing the displayed text.

Fixes #285

Type of change

• New feature (non-breaking change which adds functionality)
• Bug fix (non-breaking change which fixes an issue)
• Documentation (non-breaking change that adds or improves the documentation)
• Optimisation (non-breaking, back-end change that speeds up the code)

Key checklist

• Pre-commit hooks run successfully (pre-commit run -a)
• All tests pass (pytest)
• The documentation builds without warnings (mkdocs build -s)
• Check the GUI still works (if relevant)
• Check the code works with actual hardware (if relevant)
• Check the pyinstaller-built executable works (if relevant)

Further checks

• Code is commented, particularly in hard-to-understand areas
• Tests have been added or an issue has been opened to tackle that in the future.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.82%. Comparing base (6d86e1b) to head (b8d79cb).
Report is 15 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #657      +/-   ##
==========================================
+ Coverage   84.67%   84.82%   +0.15%     
==========================================
  Files          69       69              
  Lines        3452     3454       +2     
==========================================
+ Hits         2923     2930       +7     
+ Misses        529      524       -5     

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[alexdewar]

Neat! Thanks 👍