See gh-14028

See gh-14028

The Spring Boot integration is now handled by the Narayana project
itself at https://github.com/snowdrop/narayana-spring-boot

This commit removes our support.

Closes gh-12026

Closes gh-14120

Closes gh-14119

Closes gh-14118

Closes gh-14117

Closes gh-14116

Closes gh-14115

Closes gh-14114

Closes gh-14113

Closes gh-14112

Closes gh-14111

Closes gh-14110

Closes gh-14109

Closes gh-14108

Closes gh-14107

Closes gh-14106

Closes gh-14105

Closes gh-14104

Closes gh-14103

Closes gh-14102

Closes gh-14101

Closes gh-14100

Closes gh-14099

Closes gh-14008

The `shouldHandleFailure` configuration option has been removed from
`DispatcherServlet`.

See gh-13511

Closes gh-14038

Closes gh-14098

Closes gh-14097

Closes gh-14096

Closes gh-14095

Closes gh-14094

Closes gh-14093

Closes gh-14092

Closes gh-14091

Closes gh-14030