[TASK] Use ServerRequestInterface Object in File/FileController

Use ServerRequestInterface object introduced earlier throughout the
controller instead accessing the global variables directly.

Visibility of properties and methods became more restrictive and will
report external usage by throwing deprecated errors.

Change-Id: I68f220c4b7bb097006118d2b2065ab9f4e554b8f
Resolves: #84324
Releases: master
Reviewed-on: https://review.typo3.org/56208


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Łukasz Uznański <l.uznanski@macopedia.pl>
Tested-by: Łukasz Uznański <l.uznanski@macopedia.pl>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>