pantsbuild / pants / 29201948407

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Don't invalidate BUILD files on comment/whitespace changes (#23480)

Currently, `pants --changed-since` unnecessarily invalidates all targets
within a `BUILD` file when only whitespace or unrelated comment lines
are modified. The system falls back to a blanket invalidation because it
assumes the entire file's structural integrity changed.

### Solution
When `--changed-since` interacts with the SCM, it already populates
`sources_blocks` with the precise modified lines. However, the fallback
condition in `find_owners` was still applying a blanket invalidation to
all targets in the modified `BUILD` file, ignoring this block-level
precision.

This PR adds a guard to skip this blanket invalidation if
`sources_blocks` are available for the file, allowing `block_owners` to
correctly filter only the affected targets natively.

2 of 3 new or added lines in 2 files covered. (66.67%)

94540 of 101688 relevant lines covered (92.97%)

3.68 hits per line