Finish [SuppressTempFileChecks] attribute functionality, #898

[paulirwin]

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Finishes implementation of the [SuppressTempFileChecks] attribute functionality.

Fixes #898

Description

This attribute will cause the tear down logic to swallow any exceptions when cleaning up temporary files after the tests run. No tests actually need this attribute, but theoretically it is possible that a TestFramework user might want this.

This also fixes an issue where the previous code was treating all tests as if it had this attribute, and was not throwing if removing the temporary files failed. This change will make our tests more reliable by ensuring they fail if temp file handles are held during cleanup.

I'm also open to removing this attribute, since none of our tests need it and latest Lucene doesn't use it internally either. It could be viewed as a bad practice to just ignore these files being held too long.