hook-env: keep prepended PATH entries in front

[jdx]

With this change, if you manually run PATH="/foo:$PATH" in
your shell after activating rtx, rtx will keep "/foo" in front of its own PATH entries.
Fixes #863

[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ ACTION	actionlint	5		0	0.09s
✅ BASH	bash-exec	19		0	0.04s
✅ BASH	shellcheck	19		0	0.33s
✅ BASH	shfmt	19	0	0	0.04s
✅ DOCKERFILE	hadolint	7		0	0.14s
✅ EDITORCONFIG	editorconfig-checker	468		0	0.51s
✅ JSON	eslint-plugin-jsonc	7	0	0	1.0s
✅ JSON	jsonlint	6		0	0.13s
✅ JSON	prettier	7	0	0	0.65s
✅ JSON	v8r	7		0	4.23s
✅ MARKDOWN	markdownlint	13	0	0	2.72s
✅ MARKDOWN	markdown-link-check	13		0	10.42s
✅ MARKDOWN	markdown-table-formatter	13	0	0	0.4s
✅ PYTHON	bandit	1		0	0.76s
✅ PYTHON	black	1	0	0	0.69s
✅ PYTHON	flake8	1		0	0.42s
✅ PYTHON	isort	1	0	0	0.34s
✅ PYTHON	mypy	1		0	2.19s
✅ PYTHON	pylint	1		0	1.23s
✅ PYTHON	pyright	1		0	6.05s
✅ PYTHON	ruff	1	0	0	0.04s
✅ REPOSITORY	dustilock	yes		no	0.01s
✅ REPOSITORY	gitleaks	yes		no	2.62s
✅ REPOSITORY	git_diff	yes		no	0.03s
✅ REPOSITORY	secretlint	yes		no	2.14s
✅ REPOSITORY	syft	yes		no	0.67s
✅ REPOSITORY	trivy-sbom	yes		no	0.99s
✅ REPOSITORY	trufflehog	yes		no	2.79s
✅ RUBY	rubocop	2	0	0	4.93s
✅ RUST	clippy	yes		no	102.42s
✅ XML	xmllint	5	0	0	0.04s
✅ YAML	prettier	12	0	0	1.2s
✅ YAML	v8r	12		0	12.43s
✅ YAML	yamllint	12		0	0.4s

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (784d153) 86.14% compared to head (cec68cc) 84.37%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1150      +/-   ##
==========================================
- Coverage   86.14%   84.37%   -1.78%     
==========================================
  Files         138      138              
  Lines       12706    12718      +12     
==========================================
- Hits        10946    10731     -215     
- Misses       1760     1987     +227     

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