refactor(knora-admin): Remove unused Institution class and its properties (DEV-3365)

[seakayone]

Pull Request Checklist

Task Description/Number

Issue Number: DEV-

PR Type

• build/chore: maintenance tasks (no production code change)
• docs: documentation changes (no production code change)
• feat: represents new features
• fix: represents bug fixes
• perf: performance improvements
• refactor: represents production code refactoring
• test: adding or refactoring tests (no production code change)

Basic requirements for bug fixes and features

• Tests for the changes have been added
• Docs have been added / updated

Does this PR introduce a breaking change?

• Yes

Does this PR change client-test-data?

• Yes

[codecov]

Codecov Report

Attention: Patch coverage is 4.34783% with 22 lines in your changes are missing coverage. Please review.

Project coverage is 88.77%. Comparing base (eac5751) to head (998e921).
Report is 126 commits behind head on main.

Files	Patch %	Lines
...plestore/upgrade/plugins/UpgradePluginPR3110.scala	0.00%	13 Missing ⚠️
...e/upgrade/plugins/AbstractSparqlUpdatePlugin.scala	0.00%	7 Missing ⚠️
...ore/triplestore/upgrade/RepositoryUpdatePlan.scala	0.00%	1 Missing ⚠️
.../store/triplestore/upgrade/RepositoryUpdater.scala	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #3109       +/-   ##
===========================================
+ Coverage   11.74%   88.77%   +77.03%     
===========================================
  Files         246      262       +16     
  Lines       22907    22396      -511     
===========================================
+ Hits         2690    19883    +17193     
+ Misses      20217     2513    -17704     

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[linear]

DEV-3365 Remove belongsToInstitution property from knora-admin:knoraProject

[BalduinLandolt]

Nice!
Would you mind adding this to the migrations RFC? I think that's already a bit more ergonomical than it used to be - and it should be fast since it works only on one graph.

[BalduinLandolt]

Looks good now