Merge bitcoin#19013: test: add v0.20.1, v0.21.0 and v22.0 to backwards compatibility test

24cec4b test: Fix intermittent test failure in feature_backwards_compatibility (MarcoFalke)
d8b705f test: previous releases: add v22.0 (Sjors Provoost)
40849ee test: bump sandbox argument minimum version (Sjors Provoost)
8a57a06 test: previous releases: add v0.21.0 (Sjors Provoost)
8cba75f test: v0.20.1 backwards compatibility (Sjors Provoost)
0e4b695 test: backwards compatibility: misc fixes (Sjors Provoost)
76557cb test: Remove i686 from test/get_previous_releases.py (MarcoFalke)

Pull request description:

  This also simplifies the tests a bit.

ACKs for top commit:
  ryanofsky:
    Code review ACK 24cec4b. Only change since last review is rebasing and adding comment and whitelist args.

Tree-SHA512: 85a603ddd70fd8f0180d00fb84eb2ad2f92d6199b7d3f7c1abd660bfba53f869faf40f1a4183a8ce15dbd496ee3132d879c1258651c9d443ece69e5fe328bd26

Author: MarcoFalke

ci/test/00_setup_env_native_qt5.sh

@@ -14,6 +14,6 @@ export TEST_RUNNER_EXTRA="--previous-releases --coverage --extended --exclude fe
 export RUN_UNIT_TESTS_SEQUENTIAL="true"
 export RUN_UNIT_TESTS="false"
 export GOAL="install"
-export PREVIOUS_RELEASES_TO_DOWNLOAD="v0.15.2 v0.16.3 v0.17.2 v0.18.1 v0.19.1 v0.20.1"
+export PREVIOUS_RELEASES_TO_DOWNLOAD="v0.15.2 v0.16.3 v0.17.2 v0.18.1 v0.19.1 v0.20.1 v0.21.0 v22.0"
 export BITCOIN_CONFIG="--enable-zmq --with-libs=no --with-gui=qt5 --enable-reduce-exports \
 --enable-debug --disable-fuzz-binary  CFLAGS=\"-g0 -O2 -funsigned-char\" CXXFLAGS=\"-g0 -O2 -funsigned-char\" CC=gcc-8 CXX=g++-8"

test/README.md

@@ -98,7 +98,7 @@ test/functional/test_runner.py --extended
 In order to run backwards compatibility tests, download the previous node binaries:
 
 ```
-test/get_previous_releases.py -b v0.20.1 v0.19.1 v0.18.1 v0.17.2 v0.16.3 v0.15.2
+test/get_previous_releases.py -b v22.0 v0.21.0 v0.20.1 v0.19.1 v0.18.1 v0.17.2 v0.16.3 v0.15.2
 ```
 
 By default, up to 4 tests will be run in parallel by test_runner. To specify