Update to rust 1.44.0 (#10585)

* Update rust 1.44.0

* Update rust nightly 1.46.0

* Update docs

* Fix clippy errors

* Compile all source code with stable and nightly

* Add another note

* script tweaks

* Fix a test...

* Add another workaround

* Add hack

* Increase timeout...

* Revert "Add hack"

This reverts commit 5960f087203be8792ec0728a6755288c317a2788.

* Revert "Add another workaround"

This reverts commit e14300d01ffd1b8e86e676662177545549b45c13.

* Require nightly rustfmt and use older nightly a bit

* Improve document a bit

* Revert now not-existing clippy check...

ci/test-coverage.sh

@@ -11,7 +11,11 @@ annotate() {
 source ci/upload-ci-artifact.sh
 source scripts/ulimit-n.sh
 
-scripts/coverage.sh
+scripts/coverage.sh "$@"
+
+if [[ -z $CI ]]; then
+  exit
+fi
 
 report=coverage-"${CI_COMMIT:0:9}".tar.gz
 mv target/cov/report.tar.gz "$report"