ALEC-244: Fix for ALEC to work when multiple UI plugins are installed

[synqotik]

Currently in Horizon 30/31.0, ALEC and other plugins will only work if it is the only UI plugin currently installed.

Horizon 31.x is being updated to allow multiple installed plugins to work. However, this requires some changes to ALEC and other plugins.

Note that the new Horizon changes include code to check for 'legacy' plugin pattern to retain backward compatibility.

• extensionId should be unique per plugin and set in blueprint.xml as well as used elsewhere

• OpenNMS/Horizon is being updated to dynamically create parent Vue routes per plugin. Plugins should add their own routes as children under this route in order to work correctly. Code has been added so that new ALEC code should still work with old/existing OpenNMS code

Note: These new changes should work with existing Horizon 31.0 as well as upcoming Horizon update which includes the changes below.

See OpenNMS PR: OpenNMS/opennms#5515

[sonarcloud]

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