[test] Move irJsText tests to irText directory

So that all irText tests could be found in one place

compiler/testData/ir/irText/js/dynamic/dynamicExclExclOperator.ir.txt

@@ -0,0 +1,8 @@
+FILE fqName:<root> fileName:/dynamicExclExclOperator.kt
+  FUN name:test visibility:public modality:FINAL <> (d:dynamic) returnType:dynamic
+    VALUE_PARAMETER name:d index:0 type:dynamic
+    BLOCK_BODY
+      RETURN type=kotlin.Nothing from='public final fun test (d: dynamic): dynamic declared in <root>'
+        CALL 'public final fun CHECK_NOT_NULL <T0> (arg0: T0 of kotlin.internal.ir.CHECK_NOT_NULL?): T0 of kotlin.internal.ir.CHECK_NOT_NULL declared in kotlin.internal.ir' type=dynamic origin=EXCLEXCL
+          <T0>: dynamic
+          arg0: GET_VAR 'd: dynamic declared in <root>.test' type=dynamic origin=null