Feat #626 [ReferenceData] categories - hierarchy view improvements

[joao4all]

Prerequisites

• [x] I have written a descriptive pull-request title
• [x] I have verified that there are no overlapping pull-requests open
• [x] I have verified that I am following the COMET-WEB code style guidelines
• [x] I have provided test coverage for my change (where applicable)

Description

Closes #626 [ReferenceData] categories - hierarchy view improvements

OBS: additionally, this PR also included big refactors for the Diagram component

Screenshot

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
91.2% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud