Add LegacyUIDeprecated rule and unittests

[rafaelpierre]

Adds LegacyUIDeprecated rule to upgrade/rules as per:

https://github.com/apache/airflow/blob/master/UPDATING.md#drop-legacy-ui-in-favor-of-fab-rbac-ui

Closes: #11019

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[boring-cyborg]

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[rafaelpierre]

thanks @turbaszek!

[rafaelpierre]

@turbaszek replaced one quote with three quotes in the test msg, should be fine now

[rafaelpierre]

@turbaszek thanks for approving! just to check, should I close the PR? I noticed some of the tests are being skipped - from the logs it indicates that perhaps it is failing for Python 2.7

[turbaszek]

Please rebase your PR, we added few changes that should fix the CI issues. Please do rebase and try to avoid merge commits, more information:
https://github.com/apache/airflow/blob/master/CONTRIBUTING.rst#id9

[rafaelpierre]

rebased PR with changes for fixing CI issues. added test if rbac is None

[turbaszek]

@rafaelpierre if you would like I can help you with sorting out the commits 👍

[rafaelpierre]

@turbaszek much appreciated, thanks! I'm not that familiar with rebase :) one thing I'm struggling with is that I have already rebased, however it still shows that these files are conflicting:

breeze-complete
scripts/ci/libraries/_initialization.sh
scripts/docker/install_mysql.sh

however, if you look into the first file in the my branch, it doesn't have any conflict (line 138 looks the same as from v1-10-test)

[turbaszek]

Probably we can use single quote string 👌

[turbaszek]

@rafaelpierre can you please take a look at the CI problems:

tests/upgrade/rules/test_legacy_ui_deprecated.py:37:5: E303 too many blank lines (2)
airflow/upgrade/rules/legacy_ui_deprecated.py:32:111: E501 line too long (118 > 110 characters)

[github-actions]

The CI and PROD Docker Images for the build are prepared in a separate "Build Image" workflow,
that you will not see in the list of checks (you will see "Wait for images" jobs instead).

You can checks the status of those images in The workflow run

[github-actions]

The CI and PROD Docker Images for the build are prepared in a separate "Build Image" workflow,
that you will not see in the list of checks (you will see "Wait for images" jobs instead).

You can checks the status of those images in The workflow run

[github-actions]

The Build Workflow run is cancelling this PR. It has some failed jobs matching ^Pylint$,^Static checks$,^Build docs$,^Spell check docs$,^Backport packages$,^Checks: Helm tests$,^Test OpenAPI*.