Remove pattern from suppress trait entries

The suppress trait contained a restrictive pattern trait that was
not present in validator ID definitions. This meant that validation
events could be suppressed in metadata suppressions (where there was
no pattern validation), but not using the `@suppress` trait. Adding
the pattern from the `@suppress` trait to validation event IDs at
this point has the potential to break existing models, so that is
not a desirable alternative.

Closes #987

smithy-model/src/main/resources/software/amazon/smithy/model/loader/prelude.smithy

@@ -978,7 +978,6 @@ structure hostLabel {}
 /// Suppresses validation events by ID for a given shape.
 @trait
 list suppress {
-    @pattern("^[_a-zA-Z][A-Za-z0-9]*$")
     @length(min: 1)
     member: String
 }

smithy-model/src/test/resources/software/amazon/smithy/model/errorfiles/loader/suppression-test.errors

@@ -4,4 +4,4 @@
 [SUPPRESSED] smithy.example#List2$member: Members? Yuck! | ListMembersAreBadOkay
 [SUPPRESSED] -: Unable to locate a validator named `UnknownValidator2` (Please ignore this) | UnknownValidator_UnknownValidator2
 [WARNING] -: Unable to locate a validator named `UnknownValidator1` | UnknownValidator_UnknownValidator1
-[SUPPRESSED] smithy.example#MyService: This is suppressed | SuppressedValidator
+[SUPPRESSED] smithy.example#MyService: This is suppressed | SuppressedValidator.Foo

smithy-model/src/test/resources/software/amazon/smithy/model/errorfiles/loader/suppression-test.smithy

@@ -21,7 +21,7 @@ metadata validators = [
     {
         // This one is suppressed.
         name: "EmitEachSelector",
-        id: "SuppressedValidator",
+        id: "SuppressedValidator.Foo",
         message: "This is suppressed",
         severity: "WARNING",
         configuration: {
@@ -43,11 +43,11 @@ metadata suppressions = [
         reason: "Please ignore this",
     },
     {
-        id: "SuppressedValidator",
+        id: "SuppressedValidator.Foo",
         namespace: "smithy.example.ignore.this.one", // matches nothing
     },
     {
-        id: "SuppressedValidator",
+        id: "SuppressedValidator.Foo",
         namespace: "smithy.example"
     },
 ]
@@ -60,6 +60,7 @@ service MyService {
     operations: [GetFoo],
 }
 
+@suppress(["IgnoreMe.Too"])
 operation GetFoo {
     input: GetFooInput,
     output: GetFooOutput