RFR: 8313739: ZipOutputStream.close() should always close the wrapped stream [v4]

[Eirik Bjørsnøs]

> Please consider this PR which makes `DeflaterOutputStream.close()` always close its wrapped output stream exactly once.
> 
> Currently, closing of the wrapped output stream happens outside the finally block where `finish()` is called. If `finish()` throws, this means the wrapped stream will not be closed. This can potentially lead to leaking resources such as file descriptors or sockets.
> 
> This fix is to move the closing of the wrapped stream inside the finally block.
> 
> Additionally, the `closed = true;` statement is moved to the start of the close method. This makes sure we only ever close the wrapped stream once (this aligns with the overridden method `FilterOutputStream.close´)
> 
> Specification: This change brings the implementation of `DeflaterOutputStream.close()` in line with its specification:  *Writes remaining compressed data to the output stream and closes the underlying stream.*
> 
> Risk: This is a behavioural change. There is a small risk that existing code depends on the close method not following its specification.
> 
> Testing: The PR adds a new JUnit 5 test `CloseWrappedStream.java` which simulates the failure condition and verifies that the wrapped stream was closed under failing and non-failing conditions.

Eirik Bjørsnøs has updated the pull request incrementally with one additional commit since the last revision:

  Update test/jdk/java/util/zip/ZipOutputStream/CloseWrappedStream.java
  
  Remove extra whitespace
  
  Co-authored-by: Andrey Turbanov <turbanoff at gmail.com>

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/17209/files
  - new: https://git.openjdk.org/jdk/pull/17209/files/33e7756e..96deca07

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=17209&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=17209&range=02-03

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/17209.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17209/head:pull/17209

PR: https://git.openjdk.org/jdk/pull/17209