Summary:
Failures in `InvalidatePageCache` will change the API contract. So we remove the status check for `InvalidatePageCache` in `SstFileWriter::Add()`, `SstFileWriter::Finish` and `Rep::DeleteRange`

Pull Request resolved: https://github.com/facebook/rocksdb/pull/8156

Reviewed By: riversand963

Differential Revision: D27597012

Pulled By: ajkr

fbshipit-source-id: 2872051695d50cc47ed0f2848dc582464c00076f