test(functional): use inline-snapshot

[mkniewallner]

Use inline-snapshot in functional tests to make it easier to maintain test outputs. Since the snapshots are now automatically updated, we can also use the text reporter in tests instead of JSON output.

Because Windows outputs paths differently, I've added an hidden argument that enforces POSIX paths.

I've also added a method in VirtualEnv to run deptry, which by default enforces POSIX paths, and disables ANSI characters to avoid colours in the test outputs.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.1%. Comparing base (610e4ed) to head (ac8d107).

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #1464     +/-   ##
=======================================
+ Coverage   93.6%   97.1%   +3.5%     
=======================================
  Files         38      38             
  Lines       1034    1041      +7     
  Branches     102     103      +1     
=======================================
+ Hits         968    1011     +43     
+ Misses        53      21     -32     
+ Partials      13       9      -4     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.