fix(amazonq): fix LinkageError when starting AmazonQLspService (#5618)

In certain IDE environments, for example when user has the latest Scala plugin, Amazon Q attempts to load lsp4j through
transitive optional dependencies instead of through the IDE.

Ideally we do not bundle the library, but this is not possible until JetBrains can guarantee stronger isolation between plugins

Author: rli

.changes/next-release/bugfix-7c7e1720-545f-4b5e-8d21-511f40fabf38.json

@@ -0,0 +1,4 @@
+{
+  "type" : "bugfix",
+  "description" : "Fix LinkageError while attempting to do Amazon Q inline suggestions in certain environments"
+}

gradle/libs.versions.toml

@@ -22,6 +22,7 @@ junit5 = "5.11.0"
 kotlin = "2.0.0"
 # set in <root>/settings.gradle.kts
 kotlinCoroutines = "1.8.0"
+lsp4j = "0.24.0"
 mockito = "5.12.0"
 mockitoKotlin = "5.4.0"
 mockk = "1.13.17"
@@ -105,6 +106,7 @@ kotlin-coroutinesTest = { module = "org.jetbrains.kotlinx:kotlinx-coroutines-tes
 kotlin-reflect = { module = "org.jetbrains.kotlin:kotlin-reflect", version.ref = "kotlin" }
 kotlin-stdLibJdk8 = { module = "org.jetbrains.kotlin:kotlin-stdlib-jdk8", version.ref = "kotlin" }
 kotlin-test = { module = "org.jetbrains.kotlin:kotlin-test-junit", version.ref = "kotlin" }
+lsp4j = { module = "org.eclipse.lsp4j:org.eclipse.lsp4j", version.ref = "lsp4j" }
 mockito-core = { module = "org.mockito:mockito-core", version.ref = "mockito" }
 mockito-junit-jupiter = { module = "org.mockito:mockito-junit-jupiter", version.ref = "mockito" }
 mockito-kotlin = { module = "org.mockito.kotlin:mockito-kotlin", version.ref = "mockitoKotlin" }

plugins/amazonq/build.gradle.kts

@@ -36,6 +36,7 @@ dependencies {
     implementation(project(":plugin-amazonq:codewhisperer"))
     implementation(project(":plugin-amazonq:mynah-ui"))
     implementation(project(":plugin-amazonq:shared"))
+    implementation(libs.lsp4j)
 
     testImplementation(project(":plugin-core"))
 }