Final release: bump up version to 1.41.0 (grpc#27476)

* Bump version to 1.41.0

* Regenerate projects

Core 19: bump core version from 18.0.0 to 19.0.0 (grpc#27394)

* Bump core version to 19.0.0

* Regenerate projects

Disable grpc_status_test for sync stack in Python2 (grpc#27374)

* Disable grpc_status_test for sync stack in Python2

* Correct the if condition

* Also disable this test in Bazel

* Clean the unnecessary import in BUILD

C++ opencensus filter: Fix point of creating context for overall call (…

…grpc#27221) (grpc#27238)

Regenerate projects

Bump 1.39.x branch to 1.39.1 (grpc#26900)

* Bump version to 1.39.1

* Regenerate projects

Increase timeout of macos artifact build to 4 hours (grpc#26738)

Bump v1.39.x branch to 1.39.0-pre1 (grpc#26596)

* Bump version to 1.39.0-pre1

* Regenerate projects

Bump v1.38.x to 1.38.1 (grpc#26511)

* Bump v1.38.x to 1.38.1

* Regenerate projects

Provide custom sponge configs to exclude manual runs from testgrid (g…

…rpc#26283) (grpc#26313)

* Provide custom sponge configs

* Correct the script

* Allow test scripts to produce artifacts through Docker

* Overcome the direcotry clone in our docker script

* Expose TESTGRID_EXCLUDE and GIT_ORIGIN_URL through docker run

* Make sanity tests happy