When quickly running the "frame step" and "insert key"
operators it was possible to run the key insertion when the
depsgraph hasn't yet been updated.
Because the key insertion code took the frame from the scene,
but the channel values
from the depsgraph, the inserted keys were appearing to be
duplicated from a different frame.
Compared to the previous solution #124583 this moves
the code to ensure an evaluated depsgraph
into a new invoke function for the operator.
This avoids the performance issues when calling the
operator from python (#125888)
Pull Request: https://projects.blender.org/blender/blender/pulls/126123
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