fix(tia): fingerprint the configuration file in use

[lazerg]

What:

• Bug Fix
• New Feature

Description:

The TIA fingerprint hashed phpunit.xml and phpunit.xml.dist by name, so -c / --configuration never reached it. pest --tia and pest --tia -c alternate.xml shared one graph even though the two files can declare different testsuites, excluded groups, bootstrap and source roots, and results recorded under one config were replayed under the other.

compute() now takes the run's arguments and hashes whatever configuration the run actually resolves: the -c value when there is one (file or directory), otherwise phpunit.xml falling back to phpunit.xml.dist. The active config is hashed whether or not git tracks it, since an untracked local phpunit.xml still decides what the run does.

I checked this against a scaffolded project with a seeded graph. Before, --tia -c alternate.xml replayed all six cached results; after, it drops the graph and re-records, and plain --tia, -c phpunit.xml and -c ./ all still replay.

Happy to add a tests/Features/Tia scenario for it if you want one.

Related:

Fixes #1858.