commit idea inspection settings to disable unnecessary warnings in test code

[NathanQingyangXu]

This PR aims to eliminate the following two annoying inspection warnings in IDEA:

1. @NullMarked fieldfs must be initialized (nullness warnings are only useful for production code; if NPE happens in test code, testing has failed and we should have fixedf it already)

2. Value of ??? is always ??? (so common in testing code due to insufficient testing coverage; currently the issue only manifests itself in com.mongodb.hibernate.internal.cfg.MongoConfigurationBuilderTests)

The .idea/inspectionProfiles/Project_Default.xml was committed, which contains two inspection rules to only enable the above two inspections for Production code.

Note that to test it, you need to restart the IDE when you have switched to the feature branch from main branch. But once restarted, the annoying two warnings for test code would disappear.

[stIncMale]

I did not re-verified the last commit. Approving with the assumption that you did.

The last reviewed commit is 7811f14.