state_tracker: Add destroying routine for feedback and select stages

Fixes leaking memory on iris.

Signed-off-by: Yevhenii Kolesnikov <yevhenii.kolesnikov@globallogic.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
13 jobs for !1454 with fix/memleak_feedback_select_destroy in 12 minutes and 19 seconds (queued for 1 second)
latest detached
Status Job ID Name Coverage
  Containers Build
passed #449703
debian

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  Build+Test
passed #449712
meson-arm64

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meson-armhf

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meson-clang

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passed #449709
meson-clover

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passed #449713
meson-i386

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passed #449708
meson-main

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passed #449704
meson-swr-glvnd

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passed #449710
meson-vulkan

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scons-llvm

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passed #449714
scons-nollvm

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passed #449706
scons-swr

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passed #449707
scons-win64

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