Tags should not be unique in cycle

[FlorianJacta]

Description
Scenario tags are unique within each cycle. It needs to be better suited.

For example, I want to say that some scenarios are more important than others. I could use the term "High priority" for multiple scenarios inside a cycle. Right now, it is not possible as tags are unique for each cycle.

Acceptance Criteria

• Ensure new code is unit tested, and check code coverage is at least 90%
• Propagate any change on the demos and run all of them to ensure there is no breaking change
• Ensure any change is well documented and/or a new issue is created on the taipy-doc repository

[jrobinAV]

In the _ScenarioManager, the static _tag method should be updated by removing the "old_tagged_scenario" update a follows:

    @classmethod
    def _tag(cls, scenario: Scenario, tag: str):
        tags = scenario.properties.get(cls._AUTHORIZED_TAGS_KEY, set())
        if len(tags) > 0 and tag not in tags:
            raise UnauthorizedTagError(f"Tag `{tag}` not authorized by scenario configuration `{scenario.config_id}`")
        scenario._add_tag(tag)
        cls._set(scenario)
        Notifier.publish(
            _make_event(scenario, EventOperation.UPDATE, attribute_name="tags", attribute_value=scenario.tags)
        )

• Unit tests must be updated as well.
• The ref manual of the Scenario class and the taipy module must be updated.