Convert ENVO matchings from `iao:may be identical` to `skos:closeMatch`

[l-emele]

Summary of the discussion

This PR converts ENVO matchings using the annotation iao:may be identical to the annotation skos:closeMatch. It also makes sure that matched IRIs are not treated as literals.

Mappings to other ontologies (e.g. CHEBI) will be changed in subsequent pull requests.

Type of change (CHANGELOG.md)

Update

• air
• air pollution
• anthracite
• biogas
• charcoal
• chemical energy
• climate system
• coal
• coal power plant
• electrical energy
• energy
• geothermal energy
• geothermal power plant
• kinetic energy
• lignite
• lignite power plant
• motor
• natural gas
• nuclear power plant
• particulate matter
• peat
• PM2.5
• PM10
• pollution
• potential energy
• power plant with electromotive generator
• radiation
• radiative energy
• river
• solar power plant
• solar radiation
• sub bituminous coal
• thermal energy
• tidal flow
• transport
• vehicle
• waste role
• wind

Workflow checklist

Automation

Part of #636

PR-Assignee

• [ ] 🐙 Follow the Pull Request Workflow
• [ ] 📝 Update the CHANGELOG.md
• [ ] 📙 Add #'s to term tracker item

Reviewer

• [ ] 🐙 Follow the Reviewer Guide
• [ ] 🐙 Provided feedback and show sufficient appreciation for the work done