Optimize Tutor's openedx image

[kdmccormick]

Background

See parent issue

Tasks

• Install all edx-platform dependencies from PyPI, not GitHub openedx-unsupported/wg-developer-experience#153
• Remove libsass from base requirements for edx-ora2 edx-ora2#1986
• Implicitly mount and install edx-platform packages openedx-unsupported/wg-developer-experience#177
• Audit and clean up edx-platform requirements openedx-platform#31505
• Profile Docker image build #20
• When building image, use layer cache from pulled image #19
• Build edx-platform assets without Python openedx-platform#31800
• Can we improve Docker image build time? #6
• Always install pre-built wheels edx/edx-arch-experiments#177
• [DEPR]: Asset processing in Paver openedx-platform#31895

Notes

No response