Remove generated columns from Insert/Update types

[dreinon]

Bug report

• [x] I confirm this is a bug with Supabase, not with my own application.
• [x] I confirm I have searched the Docs, GitHub Discussions, and Discord.

Describe the bug

When creating a generated column, it is treated as a regular column in the Studio UI but also when generating TS types. It should be removed from Insert/Update types.

To Reproduce

1. Create table with generated column:

CREATE TABLE people (
    ...,
    height_cm numeric,
    height_in numeric GENERATED ALWAYS AS (height_cm / 2.54) STORED
);

2. Setup a CLI and generate types.

Expected behavior

Generated columns do not appear in Insert/Update types.

[S96EA]

It looks like we should add a filter for template?