…rpc#34712)

Fix: grpc#34672
With some recent changes in core, now `grpc_ssl_credentials_create` is
guarded by `gpr_once_init`. In our current implementation, The thread
got `gpr_once_init` lock might require GIL lock during the execution of
`grpc_ssl_credentials_create`, which might cause a deadlock if another
thread is holding GIL lock and waiting for `gpr_once_init` lock.

This change adds `with nogil` to calls to native function
`grpc_ssl_credentials_create` to make sure GIL is released before
calling `grpc_ssl_credentials_create`.
<!--

If you know who should review your pull request, please assign it to
that
person, otherwise the pull request would get assigned randomly.

If your pull request is for a specific language, please add the
appropriate
lang label.

-->

…1.59.x backport) (#34725)

Backport of #34712 to v1.59.x.
---
Fix: #34672
With some recent changes in core, now `grpc_ssl_credentials_create` is
guarded by `gpr_once_init`. In our current implementation, The thread
got `gpr_once_init` lock might require GIL lock during the execution of
`grpc_ssl_credentials_create`, which might cause a deadlock if another
thread is holding GIL lock and waiting for `gpr_once_init` lock.

This change adds `with nogil` to calls to native function
`grpc_ssl_credentials_create` to make sure GIL is released before
calling `grpc_ssl_credentials_create`.
<!--

If you know who should review your pull request, please assign it to
that
person, otherwise the pull request would get assigned randomly.

If your pull request is for a specific language, please add the
appropriate
lang label.

-->

#34726)

This reverts commit 601aaf8, which
results in rolling forward #34408.

The 601aaf reversion happened because of a deadlock found in Python. The
root cause ended up being an issue with the Python wrapper and was fixed
in #34712 , so this can be rolled forward again

…th nogil (#36266)

This fix is similar to #34712 but for `grpc_google_default_credentials_create` rather than `grpc_ssl_credentials_create`

Fixes #36265
Fixes googleapis/python-bigtable#949

Closes #36266

COPYBARA_INTEGRATE_REVIEW=#36266 from parthea:repro-issue-34672 d736f6f
PiperOrigin-RevId: 623291826

…th nogil (grpc#36266)

This fix is similar to grpc#34712 but for `grpc_google_default_credentials_create` rather than `grpc_ssl_credentials_create`

Fixes grpc#36265
Fixes googleapis/python-bigtable#949

Closes grpc#36266

COPYBARA_INTEGRATE_REVIEW=grpc#36266 from parthea:repro-issue-34672 d736f6f
PiperOrigin-RevId: 623291826

…th nogil (v1.62.x backport) (#36376)

Backport of #36266 to v1.62.x.
---
This fix is similar to #34712 but for
`grpc_google_default_credentials_create` rather than
`grpc_ssl_credentials_create`

Fixes #36265
Fixes googleapis/python-bigtable#949

Co-authored-by: Anthonios Partheniou <partheniou@google.com>