See gh-20436

Closes gh-20432

This reverts commit 6828a15d.
The commit has been reverted as it breaks backwards compatiblity.

Fixes gh-20343

Closes gh-20421

* pr/20420:
  Upgrade CI to Docker 19.03.7

Closes gh-20420

See gh-20420

* pr/20388:
  Fix some deprecations

Closes gh-20388

See gh-20388

* pr/19987:
  Use ServerHttpResponse.getRawStatusCode() in WebFluxTags

Closes gh-19987

See gh-19987

* pr/20385:
  Test the Gradle Plugin against Gradle 6.2.2

Closes gh-20385

See gh-20385

Closes gh-20375

* pr/20361:
  Upgrade CI images to Ubuntu Bionic 20200219

Closes gh-20361

See gh-20361

Closes gh-20358

* pr/20355:
  Automate Ubuntu base image upgrade

Closes gh-20355

See gh-20355

* pr/20339:
  Remove redundant code

Closes gh-20339

See gh-20339

See gh-20329

Closes gh-20329

Closes gh-20330

Closes gh-20328

Closes gh-20327

Closes gh-20326

Closes gh-20325

Closes gh-20203

Closes gh-20202

Closes gh-20106

This reverts commit 34f33e8b.

See gh-20232

Closes gh-20322

Closes gh-20321

Closes gh-20320