Only show progressbar if option --progress is set

[DeepDiver1975]

Description

Related Issue

• Fixes New system:cron is generating output when everything is fine #36298

How Has This Been Tested?

• occ system:cron -> no output
• occ system:cron -p -> see progress bar

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Database schema changes (next release will require increase of minor version instead of patch)
• Breaking change (fix or feature that would cause existing functionality to change)
• Technical debt
• Tests only (no source changes)

Checklist:

• Code changes
• Unit tests added
• Acceptance tests added
• Documentation ticket raised: new option --progress for occ system:cron docs#1955
• Changelog item, see TEMPLATE

[codecov]

Codecov Report

Merging #36304 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master   #36304      +/-   ##
============================================
+ Coverage        65%      65%   +<.01%     
- Complexity    19773    19775       +2     
============================================
  Files          1271     1271              
  Lines         74696    74701       +5     
  Branches       1309     1309              
============================================
+ Hits          48555    48560       +5     
  Misses        25755    25755              
  Partials        386      386

Flag	Coverage Δ	Complexity Δ
#javascript	54% <ø> (ø)	0 <ø> (ø)	⬇️
#phpunit	66.21% <100%> (ø)	19775 <0> (+2)	⬆️

Impacted Files	Coverage Δ	Complexity Δ
core/Command/System/Cron.php	88.46% <100%> (+1.22%)	14 <0> (+2)	⬆️

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[Faldrian]

Have tried it in my 10.3 install, it works as expected.