feat(terminal): show a data provider's description once at the batch node

[roxblnfk]

What was changed

The terminal renderer used to copy a test's description onto every data set,
so a test with a #[DataProvider] repeated the same description line under
each generated data set. Now the description is printed once under the batch
node (the root of the data set tree) and suppressed on the individual data
sets. A test without a data provider keeps printing its description as before.

Before:

 DataProviders [test]
   ◆ sum
     ✓ Dataset #0:0 [0]
       Several DataProvider and DataSet attributes on one method are all collected: ...
     ✓ Dataset #0:1 [1]
       Several DataProvider and DataSet attributes on one method are all collected: ...
     ...

After:

 DataProviders [test]
   ◆ sum
     Several DataProvider and DataSet attributes on one method are all collected: ...
     ✓ Dataset #0:0 [0]
     ✓ Dataset #0:1 [1]
     ...

Implementation:

• Extracted the description block formatting from Formatter::formatCompactRun()
  into a reusable Formatter::description().
• TerminalLogger::batchStartedFromInfo() now prints the description once, from
  TestDefinition::getDescription() (same source TeamcityLogger already uses).
• TerminalLogger suppresses the per-result description while inside a batch.

Why?

The duplicated description was pure noise: identical text repeated for every
data set pushed the actual results down and made data-heavy providers hard to
read. The description belongs to the method, so it should appear once at the
root of the data set tree.

Checklist

• Tested
  • Tested manually
  • Unit tests added

[codecov]

Codecov Report

❌ Patch coverage is 46.66667% with 8 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
core/Output/Terminal/Renderer/Formatter.php	0.00%	8 Missing ⚠️

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