Previously, SpringBootContextLoader would configure its
SpringApplication with an ApplicationContextFactory that ignores
the WebApplicationType with which its called and instead returns a
hard-coded type of context based on the type of the
MergedContextConfiguration. This hard-coding would result in the
wrong type of context being used if a subsequent change was made to
the application's WebApplicationType, for example due to binding of
the spring.main.web-application-type configuration property.
This commit updates SpringBootContextLoader to configure
SpringApplication with an ApplicationContextFactory that takes the
WebApplicationType with which it is called into consideration.
Fixes gh-29170
c8de843d85