[swift-snapshot-tool] Fix snapshot filtering for release branches so that we do not include the release tags.

We only bisect on DEVELOPMENT snapshots.

Author: gottesmm

utils/swift_snapshot_tool/Sources/swift_snapshot_tool/get_tags.swift

@@ -77,12 +77,10 @@ func getTagsFromSwiftRepo(branch: Branch, dryRun: Bool = false) async throws ->
   let allTags = try! decoder.decode([Tag].self, from: await data)
   log("[INFO] Finished downloading snapshot information from github.")
 
-  let snapshotTagPrefix = "swift-\(branch.rawValue.uppercased())"
-
   // Then filter the tags to just include the specific snapshot branch
   // prefix. Add the branch to an aggregate BranchTag.
   var filteredTags: [BranchTag] = allTags.filter {
-    $0.name.starts(with: snapshotTagPrefix)
+    $0.name.starts(with: branch.tagPrefix)
   }.map {
     BranchTag(tag: $0, branch: branch)
   }

utils/swift_snapshot_tool/Sources/swift_snapshot_tool/github_repository.swift

@@ -46,4 +46,13 @@ enum Branch: String, EnumerableFlag {
   case release_5_0 = "5.0"
   case release_6_0 = "6.0"
   case release_6_2 = "6.2"
+
+  var tagPrefix: String {
+    switch self {
+    case .development:
+       "swift-\(rawValue.uppercased())"
+    default:
+       "swift-\(rawValue.uppercased())-DEVELOPMENT"
+    }
+  }
 }