Closes gh-14870

Closes gh-14869

Closes gh-14868

Closes gh-14867

Closes gh-14865

Closes gh-14864

Closes gh-14863

Closes gh-14862

See gh-14412

* pr/14859:
  Polish "Fix a broken table in doc"
  Fix a broken table in doc

Closes gh-14859

See gh-14859

See gh-14857

This commit also restores the `sed` call to sanitize the request body.

Fixes gh-14857

Closes gh-14819

Closes gh-14503

See gh-14849

Closes gh-14849

This commit adds the following configuration properties:

* `spring.thymeleaf.render-hidden-markers-before-checkboxes`
* `spring.thymeleaf.servlet.produce-partial-output-while-processing`

Closes gh-14799

* pr/14843:
  Polish