[stable12] Better result handling of email search

[nickvergessen]

The limit of the response should be respected

Fix nextcloud/spreed#617

Master/stable13 needs a different patch (collaboration rewrite) but will come soon.

[codecov]

Codecov Report

Merging #8205 into stable12 will decrease coverage by 0.03%.
The diff coverage is 25%.

@@              Coverage Diff               @@
##             stable12    #8205      +/-   ##
==============================================
- Coverage       53.84%   53.81%   -0.04%     
- Complexity      22755    22758       +3     
==============================================
  Files            1386     1386              
  Lines           87129    87180      +51     
  Branches         1331     1331              
==============================================
- Hits            46914    46913       -1     
- Misses          40215    40267      +52

Impacted Files	Coverage Δ	Complexity Δ
...es_sharing/lib/Controller/ShareesAPIController.php	56.59% <25%> (-6.65%)	121 <0> (+3)
core/js/js.js	61.27% <0%> (-0.56%)	0% <0%> (ø)
lib/private/Files/Cache/Propagator.php	96.2% <0%> (+1.26%)	16% <0%> (ø)	⬇️