Add support for filtering out specific variables when show_env is enabled

[rycli]

With show_env enabled and (some) tools that mise also installed, mise ends up printing out variables it sets in every new shell. This gets noisy, and also results in a bit of "alert fatigue", I don't actually look at it anymore.

For example: I have Deno, Go and Lua managed via Mise. Every new shell I open gets the following;

mise +DENO_INSTALL_ROOT +GOBIN +GOROOT +LUA_INIT

These essentially never change (they're always set), so I don't need them printed out. I do however want to keep show_env enabled, so that variables that I don't expect are still flagged.

---

Possible solution would be to add a show_env_ignore or similar global config option. For example:

[settings]
show_env = true
show_env_ignore = []

# prints out
# mise +DENO_INSTALL_ROOT +GOBIN +GOROOT +LUA_INIT

[settings]
show_env = true
show_env_ignore = ['GOBIN', 'GOROOT']
# or maybe: 
# show_env_ignore = ['GO*']

# prints out
# mise +DENO_INSTALL_ROOT +LUA_INIT

This would also be pretty versatile, in case there are general classes of variables I don't care about.

[jdx]

Good idea. I opened #15454 to add it as status.show_env_ignore, a list of variable names or shell globs that show_env leaves out:

[settings.status]
show_env = true
show_env_ignore = ["GO*", "DENO_INSTALL_ROOT"]

With that, mise +DENO_INSTALL_ROOT +GOBIN +GOROOT +LUA_INIT becomes mise +LUA_INIT. It also reads MISE_STATUS_MESSAGE_SHOW_ENV_IGNORE (comma-separated).

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