[core] make symbols fade out faster while zooming outupstream/improve-symbol-fade-zoom-out

Zooming outcan make symbols overlap quickly. The area previously covered
by the viewport is covered by a lot of colliding labels while the
surrounding area has no labels. This difference produces an unwanted
effect.

This reduces that effect by:
- reducing the fade duration while zooming out
- doing placement more frequently while zooming out

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