Add logging of general exception to error log in federated share polling

[mrow4a]

It can happen that polling throws an exception that a bit ambigous as Skipping external share with id "id" from remote "https://test.test. Reason: "". For debugging in such cases it might be better to log such exceptions to better understand the cause.

[update-docs]

Thanks for opening this pull request! The maintainers of this repository would appreciate it if you would create a changelog item based on your changes.

[mmattel]

Pls run: make test-php-style-fix to fix coding style error(s)

[codecov]

Codecov Report

Merging #37200 into master will increase coverage by 0.00%.
The diff coverage is 90.90%.

@@            Coverage Diff            @@
##             master   #37200   +/-   ##
=========================================
  Coverage     64.87%   64.88%           
- Complexity    19146    19147    +1     
=========================================
  Files          1269     1269           
  Lines         74947    74955    +8     
  Branches       1331     1331           
=========================================
+ Hits          48625    48632    +7     
- Misses        25930    25931    +1     
  Partials        392      392           

Flag	Coverage Δ	Complexity Δ
#javascript	54.14% <ø> (ø)	0.00 <ø> (ø)
#phpunit	66.07% <90.90%> (+<0.01%)	19147.00 <1.00> (+1.00)

Impacted Files	Coverage Δ	Complexity Δ
...s/federatedfilesharing/lib/AppInfo/Application.php	41.30% <0.00%> (-0.31%)	8.00 <0.00> (ø)
...atedfilesharing/lib/Command/PollIncomingShares.php	98.71% <100.00%> (+0.12%)	15.00 <1.00> (+1.00)

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[mrow4a]

included in #37391