FIR IDE: Add IDE tests for sample compiler plugin

analysis/analysis-api/testData/symbols/symbolByReference/withTestCompilerPluginEnabled/generatedCompanionWorksAsValue.descriptors.pretty.txt

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+@ERROR
+class WithGeneratedCompanion

analysis/analysis-api/testData/symbols/symbolByReference/withTestCompilerPluginEnabled/generatedCompanionWorksAsValue.descriptors.txt

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+KtNamedClassOrObjectSymbol:
+  annotationsList: [
+    <ERROR CLASS>()
+      psi: KtAnnotationEntry
+  ]
+  classIdIfNonLocal: test/WithGeneratedCompanion
+  classKind: CLASS
+  companionObject: null
+  isData: false
+  isExternal: false
+  isFun: false
+  isInline: false
+  isInner: false
+  modality: FINAL
+  name: WithGeneratedCompanion
+  origin: LIBRARY
+  superTypes: [
+    kotlin/Any
+  ]
+  symbolKind: TOP_LEVEL
+  typeParameters: []
+  visibility: Public
+  deprecationStatus: null

analysis/analysis-api/testData/symbols/symbolByReference/withTestCompilerPluginEnabled/generatedCompanionWorksAsValue.kt

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+// WITH_FIR_TEST_COMPILER_PLUGIN
+package test
+
+@org.jetbrains.kotlin.fir.plugin.CompanionWithFoo
+class WithGeneratedCompanion
+
+fun test() {
+    val companionObject = WithGenerated<caret>Companion
+}

analysis/analysis-api/testData/symbols/symbolByReference/withTestCompilerPluginEnabled/generatedCompanionWorksAsValue.pretty.txt

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+companion object

analysis/analysis-api/testData/symbols/symbolByReference/withTestCompilerPluginEnabled/generatedCompanionWorksAsValue.txt

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+KtNamedClassOrObjectSymbol:
+  annotationsList: []
+  classIdIfNonLocal: test/WithGeneratedCompanion.Companion
+  classKind: COMPANION_OBJECT
+  companionObject: null
+  isData: false
+  isExternal: false
+  isFun: false
+  isInline: false
+  isInner: false
+  modality: FINAL
+  name: Companion
+  origin: PLUGIN
+  superTypes: [
+    kotlin/Any
+  ]
+  symbolKind: CLASS_MEMBER
+  typeParameters: []
+  visibility: Public
+  deprecationStatus: null