[TASK] Improve rendering of file paths in reports

By using the <code>-tag, the output of paths is improved:

- XCLASS usage
- Path to ENABLE_INSTALL_TOOL
- Path to deprecation log

Resolves: #76288
Releases: master, 7.6
Change-Id: I591009cd52ba1dec6d25ff135e76b7b536b84193
Reviewed-on: https://review.typo3.org/48282


Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Andreas Fernandez <typo3@scripting-base.de>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Jigal van Hemert <jigal.van.hemert@typo3.org>
Tested-by: Jigal van Hemert <jigal.van.hemert@typo3.org>