Revert "LPS-47251 SF"

This reverts commit 5bd41f314fd668ab18ff8afac39e34c441f0c791.
Revert "LPS-47251 Apply to ServletContextUtil"

This reverts commit 531e3c31c75829e37ed7b942ef17974233dad159.
Revert "LPS-47251 Add back FileTimestampUtil"

This reverts commit 67b3bcabaf57c0b0a4b0e52cde40f71d0a3e9997.
LPS-47215 Add back FileTimestampUtil
LPS-47215 Apply to ServletContextUtil
LPS-47215 SF