RFR: 8304013: Add a fast, non-manual alternative to test/jdk/java/util/zip/ZipFile/TestTooManyEntries [v3]

[Eirik Bjorsnos]

> The TestTooManyEntries test was originally added to validate that ZIP64 files with CEN sizes exceeding what ZipFile  supports are rejected with a ZipException. The test does this by creating a large ZIP file (several gigabytes) with many enties. Because this is resource intensive, the test is currently tagged as manual.  (See #6927)
> 
> It would be useful to have a test which asserts the CEN size enforcement, but without the CPU, disk, memory and run time requirements of TestTooManyEntries.  Such a fast test can run non-manual,  without the @requires and manual tags as found in TestTooManyEntries.
> 
> This PR adds the EndOfCenValidation test which creates sparse test ZIPs where the CEN is "inflated" such that is matches the size declared in the "End of central directory" records.
> 
> While thee sparse files look large, they consume very little disk space on file systems supporting sparse files:
> 
> 
> 16 -rw-r--r--  1   2147483702 Feb  6 18:54 bad-cen-offset.zip
> 16 -rw-r--r--  1   2147483703 Feb  6 18:54 cen-size-too-large.zip
>  8 -rw-r--r--  1          132 Feb  6 18:54 invalid-zen-size.zip
> ``` 
> 
> For good measure, two new test methods are added to excercise the remaining ZipExceptions which ZipFile may throw during validation of the END record .

Eirik Bjorsnos has updated the pull request incrementally with two additional commits since the last revision:

 - Add consistent '@throws IOException if an error occurs' tags to all methods throwing IOException
 - Revert "Remove @throws as per review feedback"
   
   This reverts commit 623d37496cdfd7b1dd45fbaadda1df8b718be36d.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/12231/files
  - new: https://git.openjdk.org/jdk/pull/12231/files/623d3749..1b253a14

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=12231&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=12231&range=01-02

  Stats: 8 lines in 1 file changed: 8 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/12231.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/12231/head:pull/12231

PR: https://git.openjdk.org/jdk/pull/12231