feat: Use the test name as the test db name

[spencewenski]

Updates the test db name to be of the format
tmp/<mod_path_initials>/<test_name>[/<case_name>]/<timestamp>.
This will make it easier to find the DB involved in a test,
including allowing sorting by the test run timestamp.

This also actually fixes the issue of using run_test in cargo test causing the tracing setter to return an error.

Closes #736

[codecov]

Codecov Report

Attention: Patch coverage is 6.97674% with 40 lines in your changes missing coverage. Please review.

Project coverage is 58.87%. Comparing base (3a73400) to head (453c809).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/app/context.rs	0.00%	40 Missing ⚠️

Files with missing lines	Coverage Δ
src/testing/snapshot.rs	100.00% <100.00%> (ø)
src/tracing/mod.rs	74.81% <100.00%> (+0.74%)	⬆️
src/app/context.rs	49.74% <0.00%> (-3.61%)	⬇️

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