Bone IK controller: Make sure the absolute matrices are up to date

[Popov72]

See https://forum.babylonjs.com/t/boneikcontroller-demo-broken/43211

This bug appeared after my changes to the bone class because BoneIKController relied on a bug in the old Bone class, where the absolute transformation matrix had a value, but a wrong one - it contained the absolute bind matrix instead of the absolute matrix! To make sure we get up-to-date absolute matrices, we need to call skeleton.computeAbsoluteMatrices().

[bjsplat]

Please make sure to label your PR with "bug", "new feature" or "breaking change" label(s).
To prevent this PR from going to the changelog marked it with the "skip changelog" label.

[bjsplat]

Snapshot stored with reference name:
refs/pull/14151/merge

Test environment:
https://babylonsnapshots.z22.web.core.windows.net/refs/pull/14151/merge/index.html

To test a playground add it to the URL, for example:

https://babylonsnapshots.z22.web.core.windows.net/refs/pull/14151/merge/index.html#WGZLGJ#4600

Links to test babylon tools with this snapshot:

https://playground.babylonjs.com/?snapshot=refs/pull/14151/merge
https://sandbox.babylonjs.com/?snapshot=refs/pull/14151/merge
https://gui.babylonjs.com/?snapshot=refs/pull/14151/merge
https://nme.babylonjs.com/?snapshot=refs/pull/14151/merge

To test the snapshot in the playground with a playground ID add it after the snapshot query string:

https://playground.babylonjs.com/?snapshot=refs/pull/14151/merge#BCU1XR#0