[jdk17u-dev] RFR: 8284367: JQuery UI upgrade from 1.12.1 to 1.13.1

[Goetz Lindenmaier]

I backport this for parity with 17.0.5-oracle.

src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/HtmlDoclet.java
I had to adapt this becasue "8248863: Add search landing page to API documentation" is not in 17.

src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/toolkit/resources/stylesheet.css
Here also lack of "8248863: Add search landing page to API documentation" causes conflicts, 
but more changes are missing here.

src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/toolkit/util/DocPaths.java
The removed variable is not defined in 17. It was also added in 8248863.

test/langtools/jdk/javadoc/tool/api/basic/APITest.java
Adapted.

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Commit messages:
 - Backport ac41b78cfbb94f0b0e9a15cfcc50bdddc43811e9

Changes: https://git.openjdk.org/jdk17u-dev/pull/487/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=487&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8284367
  Stats: 883 lines in 11 files changed: 125 ins; 691 del; 67 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/487.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev pull/487/head:pull/487

PR: https://git.openjdk.org/jdk17u-dev/pull/487