See gh-24806

Previously we used org.glassfish:jakarta.el as our default EL
implementation. Since adopting it we have learned that it can be
significantly slower than Apache Tomcat's EL implementation in some
scenarios. This commit switches to using
org.apache.tomcat.embed:tomcat-embed-el by default instead of the
Glassfish implementation.

Closes gh-24744

See gh-24677

See gh-24677

See gh-24677

Fixes gh-24846

Update `LoggingSystemProperties` so that system environment properties
are also applied to the `LoggerContext`. This is required when multiple
applications are deployed to the same Servlet container. In such setups
there's only a single JVM and the System Environment can be changed
when multiple applications start at the same time.

Fixes gh-24835

Closes gh-24846

Fixes gh-24835

Closes gh-24844

This commit improves the "Application lifefycle and Probes states"
section and underlines the difference between `AvailabilityState` and
the availability of Probes over HTTP.

Closes gh-24843

Closes gh-24842

See gh-24247

Closes gh-24841

This commit updates DataSourceUnwrapper to take a separate interface
type argument if the target datasource has to be unwrapped, given that
the target type is usually not an interface.

Closes gh-24697

Closes gh-24832

Closes gh-24816

Closes gh-24830

Closes gh-24703

Closes gh-24702

Closes gh-24701

Closes gh-24829

Closes gh-24828

Closes gh-24827

Closes gh-24826