IR text tests: Unmute tests that have main function

Don't use `main` function in these tests, because `main` function
has specific mangling rules in JVM. Use other function name.

^KT-57755

compiler/testData/ir/irText/expressions/suspendConversionForExtensionFunction.sig.kt.txt

@@ -1,14 +1,10 @@
 // CHECK JVM_IR:
-//   Mangled name: #main(){}
-//   Mangled name for the signature computed from Ir:         main(){}
-//   Mangled name for the signature computed from Descriptor: main(){}%suspendConversionForExtensionFunction.kt
-//   Public signature by IR: /main|-4284757841571462650[0]
-//   Public signature by IR debug description: main(){}
-//   Public signature by Frontend: /main|8952895695315889943[0]
-//   Public signature by Frontend debug description: main(){}%suspendConversionForExtensionFunction.kt
+//   Mangled name: #runMe(){}
+//   Public signature: /runMe|1754039929145531074[0]
+//   Public signature debug description: runMe(){}
 // CHECK JS_IR NATIVE:
-//   Mangled name: #main(){}
-//   Public signature: /main|-4284757841571462650[0]
-//   Public signature debug description: main(){}
-fun main(): Unit
+//   Mangled name: #runMe(){}
+//   Public signature: /runMe|1754039929145531074[0]
+//   Public signature debug description: runMe(){}
+fun runMe(): Unit