[AAE-5414] - SSO Auth Guard - Add the concept of excluded roles

[arditdomi]

Please check if the PR fulfills these requirements

• The commit message follows our guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

What kind of change does this PR introduce? (check one with "x")

• Bugfix
• Feature
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What is the current behaviour? (You can also link to an open issue here)
https://alfresco.atlassian.net/browse/AAE-5414

What is the new behaviour?

Does this PR introduce a breaking change? (check one with "x")

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• No

If this PR contains a breaking change, please describe the impact and migration path for existing applications: ...

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