[fix](crash) be crash on DorisRAMCompoundDirectory::doDeleteFile

[cambyzju]

Issue Number: close #41721

When we open inverted_index_ram_dir_enable and close_on_error called, BE will crash:

doris::segment_v2::InvertedIndexColumnWriterImpl::close_on_error() 
  ==>lucene::index::IndexWriter::close(bool)
    ==>lucene::index::IndexWriter::closeInternal(bool) 
        ==>doris::segment_v2::DorisRAMCompoundDirectory::close() 
          ==>_CLDELETE(filesMap); （导致filesMap为null）
  ==>lucene::store::Directory::deleteFile(const char *, bool)
    ==>doris::segment_v2::DorisRAMCompoundDirectory::doDeleteFile(const char *)
      ==>filesMap->find((char*)name); （这里直接使用了filesMap导致空指针异常）

In branch 2.1, we already deleted the related codes in pr: #32418

[doris-robot]

Thank you for your contribution to Apache Doris.
Don't know what should be done next? See How to process your PR

Since 2024-03-18, the Document has been moved to doris-website.
See Doris Document.

[cambyzju]

run buildall

[github-actions]

clang-tidy review says "All clean, LGTM! 👍"

[doris-robot]

TeamCity be ut coverage result:
Function Coverage: 37.82% (8149/21549)
Line Coverage: 29.55% (67083/226994)
Region Coverage: 29.02% (34578/119132)
Branch Coverage: 24.94% (17815/71444)
Coverage Report: http://coverage.selectdb-in.cc/coverage/18a29c7c71fb0ba8d151772e08d10fa0dd9d32cf_18a29c7c71fb0ba8d151772e08d10fa0dd9d32cf/report/index.html

[cambyzju]

run buildall

[github-actions]

clang-tidy review says "All clean, LGTM! 👍"

[doris-robot]

TeamCity be ut coverage result:
Function Coverage: 37.82% (8149/21549)
Line Coverage: 29.55% (67079/227001)
Region Coverage: 29.02% (34574/119139)
Branch Coverage: 24.93% (17814/71450)
Coverage Report: http://coverage.selectdb-in.cc/coverage/b44289209e839c5b6786803d49d6968b9ff9fa8c_b44289209e839c5b6786803d49d6968b9ff9fa8c/report/index.html

[lide-reed]

LGTM