Document current issues using JDKs > 17 and nailgun (#22533)

Ran into #20603. This is quite a big gotcha and the workaround should be
documented while a proper fix is prepared (disabling nailgun by
default).

https://pantsbuild.slack.com/archives/C046T6T9U/p1753112068755689

Author: jberkel

docs/docs/jvm/java-and-scala.mdx

@@ -66,6 +66,27 @@ JDKs used by Pants are automatically fetched using [Coursier](https://get-coursi
 
 To override the default on a particular target, you can use the [`jdk=` field](../../reference/targets/java_source.mdx#jdk). It can be useful to use the [`parametrize` builtin](../using-pants/key-concepts/targets-and-build-files.mdx#parametrizing-targets) with the `jdk=` field, particularly to run test targets under multiple JDKs.
 
+To get a list of available JDK versions:
+
+```sh
+$ coursier java --available
+adoptium:1.11.0.15
+adoptium:1.11.0.16
+...
+```
+
+Please note that JDKs later than 17 are not supported by nailgun
+(see [#20603](https://github.com/pantsbuild/pants/issues/20603)), which
+must be disabled manually:
+
+```toml title="pants.toml"
+[GLOBAL]
+process_execution_local_enable_nailgun = false
+
+[jvm]
+jdk = "temurin:1.22"
+```
+
 #### Scala version
 
 The Scala version to use is configured on a resolve-by-resolve basis (see the "Third-party dependencies" section below) using the [`[scala].version_for_resolve` option](../../reference/subsystems/scala.mdx#version_for_resolve). The default Scala version for your repository will thus be whichever Scala version is configured for the "default" resolve, which is configured by the [`[jvm].default_resolve` option](../../reference/subsystems/jvm#default_resolve).

docs/notes/2.29.x.md

@@ -26,6 +26,10 @@ Fixed an issue where environment targets with empty sequence fields would overri
 
 ### Backends
 
+#### JVM
+
+Document nailgun compatibility issues.
+
 #### Python
 
 The version of [Pex](https://github.com/pex-tool/pex) used by the Python backend has been upgraded to v2.45.2.

src/python/pants/option/global_options.py

@@ -1453,7 +1453,13 @@ class BootstrapOptions:
     )
     process_execution_local_enable_nailgun = BoolOption(
         default=DEFAULT_EXECUTION_OPTIONS.process_execution_local_enable_nailgun,
-        help="Whether or not to use nailgun to run JVM requests that are marked as supporting nailgun.",
+        help=softwrap(
+            """
+            Whether or not to use nailgun to run JVM requests that are marked as supporting nailgun.
+            Note that nailgun only works correctly on JDK <= 17 and must be disabled manually for
+            later versions.
+            """
+        ),
         advanced=True,
     )
     process_execution_graceful_shutdown_timeout = IntOption(