Should ipykernel align kernel SVG with the one used by JupyterLab?

As per discussion in JupyterLab there seems to be a consensus to propose that ipykernel switches the svg icon to the one used in JupyterLab. Originally reported and discussed in https://github.com/jupyterlab/jupyterlab/issues/13991, included below for convenience:

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> ## Description
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> The buttons for launching a notebook with the Python kernel and for creating a new Python file both use a Python icon, but they look different. It is best to stick to one or the other to preserve consistency in the UI. This is of special significance given that this is what most users see first when launching JL.
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> ## Reproduce
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> 1. Open JupyterLab
> 2. Observe the Python icons are different
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> ## Expected behavior
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> The icons should be the same.
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> ## Context
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> - Operating System and version: OS X Monterey
> - Browser and version: Chrome 109.0.5414.119 (Official Build) (x86_64)
> - JupyterLab version: [4.0.0a33 binder](https://gist.github.com/jtpio/4e9a3d435d7c3950dc4150c10abbb1d7)
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> I believe I had discussed this earlier when working on my [CSS PR](https://github.com/jupyterlab/jupyterlab/pull/12673) (now sadly abandoned). If I recall, the Python icons used at the top are actually coming from the kernel and are not hard-coded in the JL frontend. Would appreciate additional context from anybody knowledgable on this.
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> _Originally posted by @dlqqq in https://github.com/jupyterlab/jupyterlab/issues/13991#issue-1583218948_