RFR: 8321616: Retire binary test vectors ZipFile/input.jar and ZipFile/input.zip [v7]

[Eirik Bjorsnos]

> This PR suggests we retire the binary test vectors `ZipFile/input.zip` and `ZipFile/input.jar`.
> 
> Binary test vectors are harder to analyze,  and sharing test vectors across unrelated tests increases maintenance burden. It would be better to have each test produce its own test vectors independently.
> 
> While visiting these dusty tests, we should take the opportunity to convert them to JUnit, add more comments and perform some mild modernization and cleanups where appropriate. We should also consider whether any test are duplicated and can be retired, see comments below.
> 
> To help reviewers, here are some comments on the updated tests:
> 
> `Available.java`
> This test currently has no jtreg `@test` header, so isn't currently active. After discussion, we decided to merge this test into `ReadZip.java`. I added some checks to verify that reading from the stream reduces the number of available bytes accordingly, also checking the behavior when the stream is closed.
> 
> `CopyJar.java`
> The concern of copying entries seems to now have better coverage in the test `zip/CopyZipFile`. We decided to retire this test rather than convert it and instead convert `CopyZipFile` to JUnit.
> 
> `EnumAfterClose.java`
> To prevent confusion with Java Enums, I suggest we rename this test to `EnumerateAfterClose`.
> 
> `FinalizeInflater.java`  
> The code verified by this test has been updated to use cleaners instead of finalizers. Still, this test code relies on finalizers. Not sure if this is an issue, but this test will need to be updated when finalizers are finally removed.
> 
> `GetDirEntry.java`
> We decided to merge this test into `ReadZip.readDirectoryEntries` rather than keeping it as a separate test.
> 
> `ReadZip.java`
> Nothing exciting here, the single main method was split into multiple JUnit methods, each focusing on a separate concern.
> 
> `ReleaseInflater.java`
> Nothing exciting, tried to add some comment to help understanding of what is tested.
> 
> `StreamZipEntriesTest.java`
> This test was using TestNG so was converted to JUnit for consistency. Added some comments to help understanding.

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

  Merge the ReadAfterClose test into ReadZip, converting it to JUnit.

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/17038/files
  - new: https://git.openjdk.org/jdk/pull/17038/files/8623effd..27fe1131

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=17038&range=06
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=17038&range=05-06

  Stats: 84 lines in 3 files changed: 33 ins; 51 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/17038.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17038/head:pull/17038

PR: https://git.openjdk.org/jdk/pull/17038