bug: fix order of env and path when using multiple versions

[jdx]

this also reversed the order of tool-versions so now it will export PATH that is equivalent to the tool-versions file.

e.g.: this tool-versions:

nodejs 18
python 3.11

will export:

PATH="~/.rtx/installs/node/18/bin:~/.rtx/installs/python/3.11/bin"

this shouldn't matter in nearly any case but it should fit more what people expect

[codecov]

Codecov Report

Base: 82.09% // Head: 82.09% // Decreases project coverage by -0.01% ⚠️

Coverage data is based on head (1b706ce) compared to base (12d0257).
Patch coverage: 100.00% of modified lines in pull request are covered.

❗ Current head 1b706ce differs from pull request most recent head c184da9. Consider uploading reports for the commit c184da9 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #170      +/-   ##
==========================================
- Coverage   82.09%   82.09%   -0.01%     
==========================================
  Files          90       90              
  Lines        2860     2859       -1     
==========================================
- Hits         2348     2347       -1     
  Misses        512      512              

Impacted Files	Coverage Δ
src/cli/env.rs	100.00% <ø> (ø)
src/cli/local.rs	76.92% <ø> (ø)
src/cli/mod.rs	87.69% <ø> (ø)
src/toolset/mod.rs	88.27% <100.00%> (-0.08%)	⬇️

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