Merge new changes from master into branch-1.8 (mlflow#2738)

* Refactor tests: split out sagemaker, tensorflow, and other model flavors from python large (mlflow#2710)

* Use pytest.ini to specify `--color=yes` (mlflow#2716)

* Change plotly to use scattergl (mlflow#2447)

* Add /health endpoint (mlflow#2725)

* Update note about MacOS compatibility (mlflow#2392)

* Make MlflowClient serializable (mlflow#2723)

Make the Java MlflowClient class implement Serializable so that it can be used in Spark jobs

* Fix autologging of Keras optimizers for TF.Keras 1.X (mlflow#2709)

Merged.

* Added model registry to index.rst; concepts.rst; aligned some languag… (mlflow#2582)

* Add mlflow.note.content to tags and documentation (mlflow#2726)

* Use LibYAML by default to increase performance in FileUtils (mlflow#2707)

* FileUtils: Try to use LibYAML by default to increase performance. By default PyYAML is using Python parser, which is significantly slower than its C++ counter-part.

* Fix slack invite link (mlflow#2733)

* Fix slack link

* Use rst syntax

* Preparing for release 1.8.0 (mlflow#2718)

* Project import generated by Copybara.

GitOrigin-RevId: f290c7d549fbb82a50f8760113d5144bb4a997ff

* Lint fix in ModelView.js

* Removing Tabs

* Fixing imports

* Fixing version numbers in react-dom

* Project import generated by Copybara.

GitOrigin-RevId: 36896445fc4b32d17da255c21f545b527dec92a3

* Style fixes

Co-authored-by: Richard Zang <Zangr@users.noreply.github.com>
Co-authored-by: Sid Murching <sid.murching@databricks.com>

Co-authored-by: Mani Parkhe <mani@databricks.com>
Co-authored-by: Harutaka Kawamura <hkawamura0130@gmail.com>
Co-authored-by: Michael Lingelbach <m.j.lbach@gmail.com>
Co-authored-by: Flynn <crflynn@users.noreply.github.com>
Co-authored-by: Jeffrey McLarty <jnmclarty@users.noreply.github.com>
Co-authored-by: juntai-zheng <39497939+juntai-zheng@users.noreply.github.com>
Co-authored-by: dmatrix <dmatrix@comcast.net>
Co-authored-by: Vojtech Micka <micka.vojtech@gmail.com>
Co-authored-by: Arjun DCunha <61438563+arjundc-db@users.noreply.github.com>
Co-authored-by: Richard Zang <Zangr@users.noreply.github.com>

Update MLflow version to 1.7.2 (mlflow#2614)

Co-authored-by: Jenkins <jenkins@databricks.com>

Fixing py docs: arguments for client APIs (mlflow#2595)

Force merging since failing tests were unrelated. docs test passed.

Model Registry UI fix (mlflow#2529)

* Model Registry UI fix
Transition stage change from `model-versions/update` to `model-versions/transition-stage`

* UUID fix

* lint

Update versions for R and Python to 1.6.0

registry.html points to model-registry.html (mlflow#2232)

* registry.html points to model-registry.html

Model Registry docs (mlflow#2021)

* Model Registry OSS docs

Co-Authored-By: Siddharth Murching <smurching@users.noreply.github.com>
Co-Authored-By: Stephanie Bodoff <stbof@users.noreply.github.com>

Merge branch 'branch-1.3' of https://github.com/mlflow/mlflow into br…

…anch-1.3

Changelog for MLflow 1.2 (mlflow#1717)

Changelog for the MLflow 1.2 release branch: branch-1.2.

Merge changelog from mlflow#1648