RFR: 8338554: Fix inconsistencies in javadoc/doclet/testLinkOption/TestRedirectLinks.java

[Jaikiran Pai]

Can I please get a review of this test-only change which proposes to clean up some issues noticed in the `TestRedirectLinks.java` test?

The `javadoc/doclet/testLinkOption/TestRedirectLinks.java` test has been failing intermittently in our CI. The root cause of those failures isn't yet clear and those failures are being tracked in https://bugs.openjdk.org/browse/JDK-8338439.

While investigating those failures, it was noticed that this test had some issues that could be addressed separately to rule out their role in the intermittent failures. 

The commit in this PR updates the test to using existing test library classes to construct the request URL as well as for constructing the SSLContext. The test is also updated to use the correct value to represent "no response body" when calling the `sendResponseHeaders()` method.

The test continues to pass with this change. We will continue investigating the intermittent failure if/when it occurs again after this change.

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Commit messages:
 - 8338554: Fix inconsistencies in javadoc/doclet/testLinkOption/TestRedirectLinks.java

Changes: https://git.openjdk.org/jdk/pull/24359/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24359&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8338554
  Stats: 99 lines in 1 file changed: 26 ins; 61 del; 12 mod
  Patch: https://git.openjdk.org/jdk/pull/24359.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24359/head:pull/24359

PR: https://git.openjdk.org/jdk/pull/24359