Turn PatternKind into a non-const enum.

PatternKind is later re-exported. const enums cannot be re-exported, as they are removed at compile time and don't exist at runtime.

This fixes a compilation error in TS3.6:

conformance_pattern_rule.ts:57:9 - error TS2475: 'const' enums can only be used in property or index access expressions or the right hand side of an import declaration or export assignment or type query.

PiperOrigin-RevId: 270688010

internal/tsetse/util/pattern_config.ts

diff --git a/internal/tsetse/util/pattern_config.ts b/internal/tsetse/util/pattern_config.ts
index bc907b1..216ce13 100644
--- a/internal/tsetse/util/pattern_config.ts
+++ b/internal/tsetse/util/pattern_config.ts
@@ -4,7 +4,7 @@
  * patterns whose name match JSConformance patterns should behave similarly (see
  * https://github.com/google/closure-compiler/wiki/JS-Conformance-Framework)
  */
-export const enum PatternKind {
+export enum PatternKind {
   BANNED_NAME = 'banned-name',
   BANNED_PROPERTY_WRITE = 'banned-property-write',
   BANNED_PROPERTY_NON_CONSTANT_WRITE = 'banned-property-non-constant-write',