feat: Add generate_deactivation_script() function in the shell_hook.rs

[mrswastik-robot]

fixes #3589

This function uses the deactivation() method from the rattler_shell crate, for which I have already created a PR conda/rattler#1278

[Hofer-Julian]

@mrswastik-robot where you able to build this locally with the changes in rattler?

[mrswastik-robot]

@mrswastik-robot where you able to build this locally with the changes in rattler?

No, I wasn't 😅! I tried by firstly making changes in the local rattler_shell crate and then giving its absolute path in the Cargo.toml of pixi to use the local crate instead of the installed one. But when I tried to build it, there are a lot of version mismatch issues with rattler_conda_types, maybe because the local version of rattler_shell is using a different version of rattler_conda_types than what the installed rattler_menuinst crate is using. What should be done in this case?

[Hofer-Julian]

What should be done in this case?

The way to do this is to change all rattler crates and point them to your local checkout. Please let me know if that works for you

[mrswastik-robot]

What should be done in this case?

The way to do this is to change all rattler crates and point them to your local checkout. Please let me know if that works for you

thanks @Hofer-Julian, I was able to build locally after this

[Hofer-Julian]

Will put this PR as draft until conda/rattler#1278 is merged