Correct swagger annotations for enums, status codes, and notification state (#37030)

## ⚠️ BREAKING ⚠️

- delete reaction endpoints is changed to return 204 No Content rather
than 200 with no content.

## Summary

Add swagger:enum annotations and migrate all enum comments from the
deprecated comma-separated format to JSON arrays. Introduce
NotifySubjectStateType with open/closed/merged values. Fix delete
reaction endpoints to return 204 instead of 200.

modules/structs/org_team.go

@@ -16,7 +16,7 @@ type Team struct {
 	Organization *Organization `json:"organization"`
 	// Whether the team has access to all repositories in the organization
 	IncludesAllRepositories bool `json:"includes_all_repositories"`
-	// enum: none,read,write,admin,owner
+	// enum: ["none","read","write","admin","owner"]
 	Permission string `json:"permission"`
 	// example: ["repo.code","repo.issues","repo.ext_issues","repo.wiki","repo.pulls","repo.releases","repo.projects","repo.ext_wiki"]
 	// Deprecated: This variable should be replaced by UnitsMap and will be dropped in later versions.
@@ -35,7 +35,7 @@ type CreateTeamOption struct {
 	Description string `json:"description" binding:"MaxSize(255)"`
 	// Whether the team has access to all repositories in the organization
 	IncludesAllRepositories bool `json:"includes_all_repositories"`
-	// enum: read,write,admin
+	// enum: ["read","write","admin"]
 	Permission string `json:"permission"`
 	// example: ["repo.actions","repo.code","repo.issues","repo.ext_issues","repo.wiki","repo.ext_wiki","repo.pulls","repo.releases","repo.projects","repo.ext_wiki"]
 	// Deprecated: This variable should be replaced by UnitsMap and will be dropped in later versions.
@@ -54,7 +54,7 @@ type EditTeamOption struct {
 	Description *string `json:"description" binding:"MaxSize(255)"`
 	// Whether the team has access to all repositories in the organization
 	IncludesAllRepositories *bool `json:"includes_all_repositories"`
-	// enum: read,write,admin
+	// enum: ["read","write","admin"]
 	Permission string `json:"permission"`
 	// example: ["repo.code","repo.issues","repo.ext_issues","repo.wiki","repo.pulls","repo.releases","repo.projects","repo.ext_wiki"]
 	// Deprecated: This variable should be replaced by UnitsMap and will be dropped in later versions.