[Core] Improve performance: remove repetitive currentFileProvider->setFile() call on PhpFileProcessor

[samsonasik]

There is already initialization early of $this->currentFileProvider->setFile($file); when call:

$parsingSystemErrors = $this->parseFileAndDecorateNodes($file);

in parseFileAndDecorateNodes() method:

rector-src/src/Application/FileProcessor/PhpFileProcessor.php

Lines 111 to 113 in 21c9e59

	private function parseFileAndDecorateNodes(File $file): array
	{
	$this->currentFileProvider->setFile($file);

so, next calls no longer needed as already set early.

so:

✔️ Remove 2 unused call $this->currentFileProvider->setFile($file);
✔️ Remove unused private method that only call another method, just use as is directly:

$this->fileProcessor->refactor($file, $configuration)

as it only do that now.

[samsonasik]

All checks have passed 🎉 @TomasVotruba it is ready for review.