RFR: 8313739: ZipOutputStream.close() should always close the wrapped stream [v5]

[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:

  Spell out what is checked by each test instead of using the word "correct"

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Changes:
  - all: https://git.openjdk.org/jdk/pull/17209/files
  - new: https://git.openjdk.org/jdk/pull/17209/files/96deca07..39a14de3

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=17209&range=04
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=17209&range=03-04

  Stats: 40 lines in 1 file changed: 33 ins; 1 del; 6 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