aggregator: Restart srcpad task on stream-start

Merged Seungha Yang requested to merge seungha.yang/gstreamer:aggregator-run-after-eos into main

Re-start srcpad task on stream-start in addition to flush event so that subclass can process data when new pad is added after EOS or an input stream is started again with stream-start event

Depends on !4782 (merged)

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