Added silent flag to symfony console task

[siad007]

Related to #960

Added silent argument to the SymfonyConsoleTask

[kenguest]

Looks good to me - just needs to be brought in line with base branch again.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@71274ab). Click here to learn what that means.
The diff coverage is 66.66%.

@@            Coverage Diff            @@
##             master     #961   +/-   ##
=========================================
  Coverage          ?   44.93%           
  Complexity        ?     9939           
=========================================
  Files             ?      500           
  Lines             ?    24082           
  Branches          ?        0           
=========================================
  Hits              ?    10822           
  Misses            ?    13260           
  Partials          ?        0

Impacted Files	Coverage Δ	Complexity Δ
...ng/tasks/ext/SymfonyConsole/SymfonyConsoleTask.php	56.86% <66.66%> (ø)	24 <2> (?)

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