A Deep Dive on is_component_build=true

[Andrew Grieve]

I spent the last two weeks trying to answer:

1) Does maintaining is_component_build=true do us more harm than good?

2) What is the overhead of is_component_build=true?

3) How can is_component_build=true be improved?

Here's my report: https://docs.google.com/document/d/1xqyjw4pK9KRCVx1SxRJ2EwTZNCLk0GzbuZsW9XBXdtQ/edit?tab=t.0

tldr:

1) no

2) 100%

3) rust and mojo are the main opportunities, but it's complicated.