[fish] Fix init hooks for fish

[mikeland73]

Summary

Fixes issue introduced in #1709

devbox run uses sh instead of native shell. So init hooks must always be sh compatible for run. On the other hand, devbox shell uses native shell so init hooks must be fish if the native shell is fish.

This is ugly, but it's how it has always worked.

#1709 introduced recursion protection that would be fish or sh depending on native shell. This worked fine for devbox shell but would break devbox run.

This change fixes that by creating 2 hooks files, one fish and one sh and sourcing the correct one in shellrc, while still always using the sh for run.

cc: @Lagoja

How was it tested?

devbox run echo 5
devbox shell
SHELL=fish devbox run echo 5
SHELL=fish devbox shell

[Lagoja]

Confirmed that this fixes the issue upon testing

[sentry-io]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ **syscall.Errno: error running script in Devbox: <redacted errors.withStack>: <redacted errors... go.jetpack.io/devbox/internal/shellgen in creat... View Issue

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