PagesCreated: add countsOnly option

[agoujot]

(It took me a laughably long time to figure out that I needed to add a line to XtoolsController to be able to add an option to a child controller.)

Bug: T229581

[codecov]

Codecov Report

❌ Patch coverage is 18.18182% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 60.71%. Comparing base (4b8eb28) to head (eabd111).
⚠️ Report is 227 commits behind head on main.

Files with missing lines	Patch %	Lines
src/Controller/PagesController.php	0.00%	7 Missing ⚠️
src/Model/Pages.php	33.33%	2 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##               main     #550       +/-   ##
=============================================
- Coverage     71.30%   60.71%   -10.59%     
- Complexity     1275     1408      +133     
=============================================
  Files            46       46               
  Lines          3792     4315      +523     
=============================================
- Hits           2704     2620       -84     
- Misses         1088     1695      +607     

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