JCRVLT-830 check if a subfolder can be removed

[joerghoh]

Implemented some additional checks to prevent the removal of unexpected files.

[joerghoh]

I made this feature configurable via OSGI. That should be only a temporary measure until we are sure that there are no side-effects. But it required a series of changes to otherwise unrelated classes to pass on that flag.

I added the OSGI property to both the FSPackageRegistry and the JcrPackageRegistry. Default is to have this feature enabled.

[joerghoh]

The initial focus for the review should be to make sure that the existing behavior (which can delete content unintentionally) can be preserved with the correct configuration.

I understand that that adding this configuration increases the size of the change quite a bit, so I wonder if a system property (or env variable) would be a better solution to keep the change smaller.

[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
94.1% Coverage on New Code
0.0% Duplication on New Code

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