Add constructor to ShadowingClassLoader to create an instance without default excludes [SPR-15439]

[spring-projects-issues]

Oliver Drotbohm opened SPR-15439 and commented

For testing purposed it would be cool to be able to use ShadowingClassLoader but without the default excludes applied.

We currently use a copy with the default excludes registration removed. We'd rather just just a constructor that allows us to skip the default exclude registration.

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Issue Links:

• DATACMNS-993 Clean up class loader hacking in tests