fix(tia): support a Pest project nested in a git repository

[jfatr]

What happens

Run vendor/bin/pest --tia in a Pest project that sits below the root of its git repository, backend/ in a monorepo for example, and Tia refuses:

Tia mode requires the git repository root

Git prints and addresses every path relative to the repository root, backend/app/Service.php, while the dependency graph keys its edges on paths relative to the project root, app/Service.php. The plugin guarded against the mismatch instead of translating it.

Related: #1805, #1809, #1820.

The fix

Translate at every place where Tia talks to git, and let a project at the repository root keep the paths, the state key and the fingerprint it has today.

• Git::pathPrefix() returns the directory of the project inside the repository, backend/, or an empty string at the root or without git.
• ChangedFiles strips that prefix off the output of git diff --name-only and git status --porcelain, drops the paths of sibling packages, and prepends it to git show <sha>:<path>. Both reads take -z records, because core.quotePath C-quotes a path outside ASCII, and --no-relative keeps the repository frame when the user sets diff.relative.
• git check-ignore runs without --no-index, so a tracked file that an ignore rule matches still counts as part of the project.
• Three places read <projectRoot>/.git directly, which is absent in a nested project and in a worktree, and now ask git: BaseRemote::readOriginUrl(), Storage and Fingerprint::isTrackedByGit().
• Storage folds the prefix into the state key, so two projects in one repository do not share a graph. The key of a project at the repository root does not change.
• The structural fingerprint carries the prefix of a nested project, so a baseline that a sibling project published to the same GitHub artifact name is rejected. The fingerprint of a project at the repository root stays byte-identical.
• The run summary reports the count of changed files outside the project, so a nested project does not look idle when the repository around it moved.
• TiaRequiresRepositoryRoot and the test that expected it go away.

Tests

tests/Features/Tia/Monorepo.php runs a nested project through replay, a working tree change, a committed change, a sibling change, an undone commit, two projects in one repository, and remote baselines for a nested project. tests/Unit/Plugins/Tia/ChangedFiles.php covers the path translation, the ignore rules on both sides of the boundary, non-ASCII paths and diff.relative. tests/Unit/Plugins/Tia/Storage.php covers the state key.

• pest --group=tia: 222 passed.
• rector, pint, phpstan and type coverage at 100 % pass.

A second pull request builds on this one and makes Tia see the code a nested project loads from outside its root, such as a Composer path repository or a sibling package.

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