[stable10] Add exception page page object and its related steps in acceptance test

[dpakach]

Backport #35265

[codecov]

Codecov Report

Merging #35281 into stable10 will increase coverage by 0.02%.
The diff coverage is n/a.

@@              Coverage Diff               @@
##             stable10   #35281      +/-   ##
==============================================
+ Coverage       64.52%   64.54%   +0.02%     
  Complexity      20080    20080              
==============================================
  Files            1289     1289              
  Lines           76947    76923      -24     
  Branches         1299     1299              
==============================================
+ Hits            49650    49651       +1     
+ Misses          26916    26891      -25     
  Partials          381      381

Flag	Coverage Δ	Complexity Δ
#javascript	53.2% <ø> (ø)	0 <ø> (ø)	⬇️
#phpunit	65.74% <ø> (+0.02%)	20080 <ø> (ø)	⬇️

Impacted Files	Coverage Δ	Complexity Δ
lib/private/Files/Storage/Wrapper/Encryption.php	76.16% <0%> (-0.25%)	156% <0%> (ø)
lib/private/Server.php	86.56% <0%> (ø)	253% <0%> (ø)	⬇️
apps/files_trashbin/lib/Expiration.php	98.27% <0%> (+1.72%)	29% <0%> (ø)	⬇️
apps/encryption/appinfo/routes.php	100% <0%> (+100%)	0% <0%> (ø)	⬇️

---

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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[codecov]

Codecov Report

Merging #35281 into stable10 will increase coverage by 0.02%.
The diff coverage is n/a.

@@              Coverage Diff               @@
##             stable10   #35281      +/-   ##
==============================================
+ Coverage       64.52%   64.54%   +0.02%     
  Complexity      20080    20080              
==============================================
  Files            1289     1289              
  Lines           76947    76923      -24     
  Branches         1299     1299              
==============================================
+ Hits            49650    49651       +1     
+ Misses          26916    26891      -25     
  Partials          381      381

Flag	Coverage Δ	Complexity Δ
#javascript	53.2% <ø> (ø)	0 <ø> (ø)	⬇️
#phpunit	65.74% <ø> (+0.02%)	20080 <ø> (ø)	⬇️

Impacted Files	Coverage Δ	Complexity Δ
lib/private/Files/Storage/Wrapper/Encryption.php	76.16% <0%> (-0.25%)	156% <0%> (ø)
lib/private/Server.php	86.56% <0%> (ø)	253% <0%> (ø)	⬇️
apps/files_trashbin/lib/Expiration.php	98.27% <0%> (+1.72%)	29% <0%> (ø)	⬇️
apps/encryption/appinfo/routes.php	100% <0%> (+100%)	0% <0%> (ø)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 1a964a1...e3b1f6b. Read the comment docs.