Add tests for install/remove labels scripts

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (fb3ad1a) 86.46% compared to head (fa60e5c) 88.39%. Report is 3 commits behind head on rc/5.1.3.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## rc/5.1.3 #759 +/- ## ============================================ + Coverage 86.46% 88.39% +1.93% ============================================ Files 19 19 Lines 2431 2431 ============================================ + Hits 2102 2149 +47 + Misses 329 282 -47 ``` [see 3 files with indirect coverage changes](https://app.codecov.io/gh/neo4j-contrib/neomodel/pull/759/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=neo4j-contrib)

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[sonarcloud[bot]]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication