[FIR] Implement flag for disabling warning on error suppression

#KT-61129

compiler/testData/cli/js/jsExtraHelp.out

@@ -77,6 +77,8 @@ where advanced options include:
                              Do not enable scripting plugin by default
   -Xdisable-phases           Disable backend phases
   -Xdisable-ultra-light-classes Do not use the ultra light classes implementation
+  -Xdont-warn-on-error-suppression
+                             Don't report a warning when an error is suppressed. Only affects K2.
   -Xdump-directory           Dump backend state into directory
   -Xdump-fqname              FqName of declaration that should be dumped
   -Xdump-perf=<path>         Dump detailed performance statistics to the specified file

compiler/testData/cli/jvm/errorSuppression.kt

@@ -0,0 +1,3 @@
+@Suppress("UNSUPPORTED")
+fun foo() {
+}

compiler/testData/cli/jvm/errorSuppressionNoWarning.args

@@ -0,0 +1,6 @@
+$TESTDATA_DIR$/errorSuppression.kt
+-language-version
+2.0
+-Xdont-warn-on-error-suppression
+-d
+$TEMP_DIR$

compiler/testData/cli/jvm/errorSuppressionNoWarning.out

@@ -0,0 +1,2 @@
+warning: language version 2.0 is experimental, there are no backwards compatibility guarantees for new language and library features
+OK

compiler/testData/cli/jvm/errorSuppressionWarning.args

@@ -0,0 +1,5 @@
+$TESTDATA_DIR$/errorSuppression.kt
+-language-version
+2.0
+-d
+$TEMP_DIR$

compiler/testData/cli/jvm/errorSuppressionWarning.out

@@ -0,0 +1,5 @@
+warning: language version 2.0 is experimental, there are no backwards compatibility guarantees for new language and library features
+compiler/testData/cli/jvm/errorSuppression.kt:1:11: warning: this code uses error suppression for 'UNSUPPORTED'. While it might compile and work, the compiler behavior is UNSPECIFIED and WON'T BE PRESERVED. Please report your use case to the Kotlin issue tracker instead: https://kotl.in/issue
+@Suppress("UNSUPPORTED")
+          ^
+OK

compiler/testData/cli/jvm/extraHelp.out

@@ -168,6 +168,8 @@ where advanced options include:
                              Do not enable scripting plugin by default
   -Xdisable-phases           Disable backend phases
   -Xdisable-ultra-light-classes Do not use the ultra light classes implementation
+  -Xdont-warn-on-error-suppression
+                             Don't report a warning when an error is suppressed. Only affects K2.
   -Xdump-directory           Dump backend state into directory
   -Xdump-fqname              FqName of declaration that should be dumped
   -Xdump-perf=<path>         Dump detailed performance statistics to the specified file