* Fix gcp auth in hashicorp vault provider.

* Fix vault gcp auth.

* Prepare jwt in test.

* Fix gcp auth in hashicorp vault provider.

* Fix failing gcp test_vault_client tests  (#3)

* Fix vault gcp auth.

* Prepare jwt in test.

* Fix gcp auth in hashicorp vault provider.

* remove redundent code

* fix failing tests

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Co-authored-by: Mohamed Morsy <messam88@gmail.com>

* Fix typo in gcp auth test.

* fix syntax and linting

* Add missing role_id in VaultHook kwargs

* Refactor gcp tests.

Add missing role_id to test_gcp_init_params.

Refactor gcp tests.

* Fix open in tests assertions.

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Co-authored-by: Mohamed Morsy <messam88@gmail.com>

…as (apache#53554)

* support auth_type=oauth2 for smtp

* add auth_type to notifications

* add ut for build_xoauth2_string & send_mime_email

* add test for smtp

* add test for notifications

* add ui widgets & property for oauth2

* add extra parameters to the docs

* fix CI test

* fix CI test #2

* fix CI test #3

* expose `build_xoauth2_string` & add fallback for old cores

* rollback email.py and test_email.py & refactor smtp.py

* refactor the doc to enrich examples and explnations