fix: handle tilde in env vars

[andrecloutier]

Summary

Adds support for ~ provided via env vars. Also removes go-homedir directly and indirectly via revive. While we could argue setting ~ in the environment is invalid, it's also a simple error to make (ASDF_DATA_DIR=~/.asdf vs ASDF_DATA_DIR="~/.asdf"). Since this code already handles parsing ~ out of the default values, it's not hard to handle the user provided case by moving the replacement a few lines down.

Fixes: #1997
Fixes: #1923

Other Information

Before

andre@Andres-MacBook-Pro asdf % ASDF_DATA_DIR="~/.asdf" asdf info 
OS:
Darwin Andres-MacBook-Pro.local 24.3.0 Darwin Kernel Version 24.3.0: Thu Jan  2 20:24:22 PST 2025; root:xnu-11215.81.4~3/RELEASE_ARM64_T6041 arm64

SHELL:
zsh 5.9 (arm64-apple-darwin24.0)

BASH VERSION:
3.2.57(1)-release

ASDF VERSION:
0.16.4

ASDF INTERNAL VARIABLES:
ASDF_DEFAULT_TOOL_VERSIONS_FILENAME=.tool-versions
ASDF_DATA_DIR=~/.asdf
ASDF_CONFIG_FILE=/Users/andre/.asdfrc

ASDF INSTALLED PLUGINS:

After

andre@Andres-MacBook-Pro asdf % ASDF_DATA_DIR="~/.asdf" ./asdf info
OS:
Darwin Andres-MacBook-Pro.local 24.3.0 Darwin Kernel Version 24.3.0: Thu Jan  2 20:24:22 PST 2025; root:xnu-11215.81.4~3/RELEASE_ARM64_T6041 arm64

SHELL:
zsh 5.9 (arm64-apple-darwin24.0)

BASH VERSION:
3.2.57(1)-release

ASDF VERSION:
"1391473-dev"

ASDF INTERNAL VARIABLES:
ASDF_DEFAULT_TOOL_VERSIONS_FILENAME=.tool-versions
ASDF_DATA_DIR=/Users/andre/.asdf
ASDF_CONFIG_FILE=/Users/andre/.asdfrc

ASDF INSTALLED PLUGINS:
bats       https://github.com/timgluz/asdf-bats.git          299551f1668b2ba11804bdca709da8933b647bb5
elixir     https://github.com/asdf-vm/asdf-elixir.git        ea842831ae39417f2dfe7b96fb0c3cc573314aa6
erlang     https://github.com/asdf-vm/asdf-erlang.git        0e617b61ece7cff73331aacc1cd9986e35618c41
go-sdk     https://github.com/yacchi/asdf-go-sdk.git         3d336a3b582ecb0e3d9337b78581bb8a955352dd