Discover new users in single user sync

[tomneedham]

Fixes #31028

[codecov]

Codecov Report

Merging #31029 into master will decrease coverage by <.01%.
The diff coverage is 66.66%.

@@             Coverage Diff              @@
##             master   #31029      +/-   ##
============================================
- Coverage     62.45%   62.45%   -0.01%     
- Complexity    18229    18230       +1     
============================================
  Files          1145     1145              
  Lines         68275    68279       +4     
  Branches       1234     1234              
============================================
+ Hits          42641    42643       +2     
- Misses        25273    25275       +2     
  Partials        361      361

Flag	Coverage Δ	Complexity Δ
#javascript	52% <ø> (ø)	0 <ø> (ø)	⬇️
#phpunit	63.64% <66.66%> (-0.01%)	18230 <0> (+1)

Impacted Files	Coverage Δ	Complexity Δ
core/Command/User/SyncBackend.php	55.05% <66.66%> (-0.12%)	43 <0> (+1)

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