fix: remove ruff N999 (#1388)

# What does this PR do?

Since we moved the move tests/client-sdk to tests/api in
https://github.com/meta-llama/llama-stack/pull/1376. The N999 rule is
not needed anymore. And furthermore in

abfbaf3c1b

[//]: # (If resolving an issue, uncomment and update the line below)
[//]: # (Closes #[issue-number])

## Test Plan
[Describe the tests you ran to verify your changes with result
summaries. *Provide clear instructions so the plan can be easily
re-executed.*]

[//]: # (## Documentation)

Signed-off-by: Sébastien Han <seb@redhat.com>

tests/integration/__init__.py

@@ -3,4 +3,3 @@
 #
 # This source code is licensed under the terms described in the LICENSE file in
 # the root directory of this source tree.
-# ruff: noqa: N999

tests/integration/agents/__init__.py

@@ -3,4 +3,3 @@
 #
 # This source code is licensed under the terms described in the LICENSE file in
 # the root directory of this source tree.
-# ruff: noqa: N999

tests/integration/inference/__init__.py

@@ -3,4 +3,3 @@
 #
 # This source code is licensed under the terms described in the LICENSE file in
 # the root directory of this source tree.
-# ruff: noqa: N999

tests/integration/safety/__init__.py

@@ -3,4 +3,3 @@
 #
 # This source code is licensed under the terms described in the LICENSE file in
 # the root directory of this source tree.
-# ruff: noqa: N999

tests/integration/vector_io/__init__.py

@@ -3,4 +3,3 @@
 #
 # This source code is licensed under the terms described in the LICENSE file in
 # the root directory of this source tree.
-# ruff: noqa: N999