ci: Switch git configuration to use EF Oniro Core Bot

To fix eclipsefdn/helpdesk#1565, EF
created a bot for us that is passing the ECA checks. Use it to unblock
the docs pipelines.

Fixes: #723


Signed-off-by: Andrei Gherzan <andrei.gherzan@huawei.com>

.oniro-ci/containers/bitbake-builder/.gitconfig

@@ -2,5 +2,5 @@
 # SPDX-License-Identifier: Apache-2.0
 
 [user]
-	name = Oniro Project CI
-	email = oniro-dev@eclipse.org
+	name = Oniro Core Project Bot
+	email = onirocore-bot@eclipse.org

.oniro-ci/containers/docs-builder/.gitconfig

 # SPDX-FileCopyrightText: 2021 Huawei Inc.
+#
 # SPDX-License-Identifier: Apache-2.0
 
 [user]
-	name = Oniro Project CI
-	email = oniro-dev@eclipse.org
+	name = Oniro Core Project Bot
+	email = onirocore-bot@eclipse.org