Update Python icon to match JupyterLab

[ajbozarth]

In jupyterlab/jupyterlab#13035 JupyterLab has updated their python svg to meet the requirements of the PSF Trademark Committee. Though the svg in that PR is very similar to the one Elyra uses, it does have some differences. As such we should switch to using the new icon.

For now I've simply updated our svgs to match the new icon, but once that PR is released (It will be in the next 3.X release, timing unknown) we will want to remove our front end svg and replace all references to it with the jupyterlab LabIcon

I've removed our python LabIcon and updated references to it to use the icon from core. I've also updated the icon served by our backend to use the new svg file as well.

For reference: The updated icon has the correct colors (the Elyra one has a slightly dark shade of yellow) and margins to match other icons in lab

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[ajbozarth]

v3.4.6 has been released, so I will be updating this as stated above

[ajbozarth]

I've pushed the updates, this is ready for review now. Screenshot below:

@ptitzler if you could take a look at this and feel free to push any doc screen shot changes as needed.

[ptitzler]

The icon colors look different but I expected them to be the same

[ajbozarth]

The icon colors look different but I expected them to be the same

Kernels supply their own icon in the form of an encoded png, in this case they are using the official logo which has an opacity gradient. So the SVG file removes the gradient and sets it to the base color, this change/difference was approved by both the PSF Trademark Committee and the core lab devs.

[karlaspuldaro]

LGTM

[ptitzler]

LGTM!

[ptitzler]

Looks like you've missed one version bump in https://github.com/ajbozarth/elyra/blob/py_icon/etc/docker/elyra_development/requirements.yml#L5