Refactor PostDropdownBtn to use new Menu (#3112)

* Refactor PostDropdownBtn

(cherry picked from commit 0adf6cb75e3d4b7c1630cf6153c0d7e289e1b859)

* Update icons

(cherry picked from commit ac89ef9b28721c00736b1388455f3f5f092de0ad)

* Port over fixes

* fix scrollbar disappearing

* Try CSS solution

* Disable arrow for now

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Co-authored-by: Hailey <me@haileyok.com>

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assets/icons/filter_stroke2_corner0_rounded.svg

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assets/icons/speakerVolumeFull_stroke2_corner0_rounded.svg

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assets/icons/trash_stroke2_corner0_rounded.svg

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assets/icons/warning_stroke2_corner0_rounded.svg

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