JS: drop "-kjsm" flag, merge logic with "-meta-info"

#KT-16049 Fixed

compiler/testData/cli/js/createKjsm.args

@@ -1,5 +0,0 @@
-compiler/testData/integration/ant/js/simpleWithoutStdlibAndFolderAsAnotherLib/jslib-example/LibraryExample.kt
--no-stdlib
--kjsm
--output
-$TEMP_DIR$/jslib-example.js

compiler/testData/cli/js/createKjsm.out

@@ -1 +0,0 @@
-OK

compiler/testData/cli/js/createKjsm.test

@@ -1,2 +0,0 @@
-// EXISTS: jslib-example.js
-// EXISTS: jslib-example/library/sample/ClassA.kjsm

compiler/testData/cli/js/createMetadata.args

@@ -1,6 +1,5 @@
 compiler/testData/integration/ant/js/simpleWithoutStdlibAndFolderAsAnotherLib/jslib-example/LibraryExample.kt
 -no-stdlib
 -meta-info
--kjsm
 -output
 $TEMP_DIR$/jslib-example.js

compiler/testData/cli/js/createMetadata.test

@@ -1,3 +1,3 @@
 // EXISTS: jslib-example.meta.js
 // EXISTS: jslib-example.js
-// EXISTS: jslib-example/library/sample/ClassA.kjsm
+// EXISTS: jslib-example/library/sample/sample.kjsm

compiler/testData/cli/js/jsHelp.out

@@ -4,8 +4,7 @@ where possible options include:
   -no-stdlib                 Don't use bundled Kotlin stdlib
   -library-files <path[,]>   Path to zipped library sources or kotlin files separated by commas
   -source-map                Generate source map
-  -meta-info                 Generate metadata
-  -kjsm                      Generate kjsm-files (for creating libraries)
+  -meta-info                 Generate .meta.js and .kjsm files with metadata. Use to create a library
   -target { v5 }             Generate JS files for specific ECMA version
   -module-kind { plain, amd, commonjs, umd }
                              Kind of a module generated by compiler