[vitormattos]

Purpose

Keep Octocov's native coverage tables and its single updated comment while making the scope of each report explicit. A newer commit with pending, canceled, or failed PHPUnit checks may not yet have a refreshed report.

Change

• Add comment.message as a short note above Octocov's native metrics table. This is additive in the currently pinned Octocov v0.83.5 implementation (createReportContent appends message before the metrics tables).
• Set testExecutionTime.steps: [PHPUnit] so the duration tracks the actual PHPUnit step across the source workflow, instead of the brief Octocov collection step.
• Keep comment.updatePrevious: true, the existing job summary, report and diff configuration intact.

Scope

Only .octocov.yml changes. No tests or business logic from #9429 are changed, and this PR does not alter the source coverage workflow or make partial/failed coverage look successful.

Validation

• Parsed updated YAML with PyYAML; asserted testExecutionTime.steps, the additional comment.message and preservation of updatePrevious, summary, report and diff.
• Inspected upstream Octocov v0.83.5 source, verifying comment.message is appended to (not substituted for) the native report; checked testExecutionTime.steps semantics against upstream documentation.
• Git commit is cryptographically verified and includes DCO sign-off.

CI publishing behavior still needs confirmation in GitHub Actions; no full PHPUnit suite was run for this configuration-only change.