fix(tia): refresh edges within the coverage scope in coverage runs

[almontasser]

What:

• Bug Fix
• New Feature

Description:

In --tia --coverage mode, Graph::replaceEdges() runs with keepExisting: true and skips every test that already has edges. When a test starts using a file it didn't touch when the graph was recorded, the coverage run never adds that edge. A later break in that file replays the test as passed.

A coverage run now replaces a test file's edges within the scope it can observe: the files its coverage data can show (files with an executable line and no ignored code), plus the Blade views that the link tracker records in both modes. It keeps recorded edges to every other file, such as files outside <source>, and adds the new edges. If the run saw a test file only in part, because a test was replayed from the cache, skipped, incomplete, risky, or narrowed by covers() or coversNothing(), it keeps all of that file's recorded edges and only adds new ones. Workers send their observed files and partly seen test files with their edge partials, so --parallel makes the same decision.

Regression tests:

• tests/Unit/Plugins/Tia/Graph.php: replaceEdges() with no observed files (plain runs), an empty list, and a list; bladeFiles().
• tests/Features/Tia/CoveragePiggyback.php, sequentially and in parallel: a coverage run adds a dependency that a test gained, and drops a dependency or a view that it lost (these fail on 5.x). It keeps an edge outside <source> or to code its coverage ignores, and keeps the edges of a test file that it filtered, replayed in part, or whose coverage it didn't record.

Related:

Fixes #1953

[nunomaduro]

hi friend, thank you! there is a lot of changes on this pr that are not related to the issue. going with #1955 for the fix, feel free to send the edge-dropping part as a separate pr.