Add PrintingMergeRequestLinkEnabled field to GET/PUT

Currently, the field seems to be only used on "Create" but as the
documentation shows, GET/PUT methods also have it supported.

More info:
- https://docs.gitlab.com/ee/api/projects.html
- https://gitlab.com/gitlab-org/gitlab/-/merge_requests/76938
- https://github.com/gitlabhq/terraform-provider-gitlab/issues/782
- gitlabhq/terraform-provider-gitlab#783

projects.go

@@ -85,6 +85,7 @@ type Project struct {
 	OnlyAllowMergeIfPipelineSucceeds          bool                       `json:"only_allow_merge_if_pipeline_succeeds"`
 	OnlyAllowMergeIfAllDiscussionsAreResolved bool                       `json:"only_allow_merge_if_all_discussions_are_resolved"`
 	RemoveSourceBranchAfterMerge              bool                       `json:"remove_source_branch_after_merge"`
+	PrintingMergeRequestLinkEnabled           bool                       `json:"printing_merge_request_link_enabled"`
 	LFSEnabled                                bool                       `json:"lfs_enabled"`
 	RepositoryStorage                         string                     `json:"repository_storage"`
 	RequestAccessEnabled                      bool                       `json:"request_access_enabled"`
@@ -621,9 +622,9 @@ type CreateProjectOptions struct {
 	PackagesEnabled                           *bool                                `url:"packages_enabled,omitempty" json:"packages_enabled,omitempty"`
 	PagesAccessLevel                          *AccessControlValue                  `url:"pages_access_level,omitempty" json:"pages_access_level,omitempty"`
 	Path                                      *string                              `url:"path,omitempty" json:"path,omitempty"`
-	PrintingMergeRequestLinkEnabled           *bool                                `url:"printing_merge_request_link_enabled,omitempty" json:"printing_merge_request_link_enabled,omitempty"`
 	PublicBuilds                              *bool                                `url:"public_builds,omitempty" json:"public_builds,omitempty"`
 	RemoveSourceBranchAfterMerge              *bool                                `url:"remove_source_branch_after_merge,omitempty" json:"remove_source_branch_after_merge,omitempty"`
+	PrintingMergeRequestLinkEnabled           *bool                                `url:"printing_merge_request_link_enabled,omitempty" json:"printing_merge_request_link_enabled,omitempty"`
 	RepositoryAccessLevel                     *AccessControlValue                  `url:"repository_access_level,omitempty" json:"repository_access_level,omitempty"`
 	RepositoryStorage                         *string                              `url:"repository_storage,omitempty" json:"repository_storage,omitempty"`
 	RequestAccessEnabled                      *bool                                `url:"request_access_enabled,omitempty" json:"request_access_enabled,omitempty"`
@@ -809,6 +810,7 @@ type EditProjectOptions struct {
 	Path                                      *string                              `url:"path,omitempty" json:"path,omitempty"`
 	PublicBuilds                              *bool                                `url:"public_builds,omitempty" json:"public_builds,omitempty"`
 	RemoveSourceBranchAfterMerge              *bool                                `url:"remove_source_branch_after_merge,omitempty" json:"remove_source_branch_after_merge,omitempty"`
+	PrintingMergeRequestLinkEnabled           *bool                                `url:"printing_merge_request_link_enabled,omitempty" json:"printing_merge_request_link_enabled,omitempty"`
 	RepositoryAccessLevel                     *AccessControlValue                  `url:"repository_access_level,omitempty" json:"repository_access_level,omitempty"`
 	RepositoryStorage                         *string                              `url:"repository_storage,omitempty" json:"repository_storage,omitempty"`
 	RequestAccessEnabled                      *bool                                `url:"request_access_enabled,omitempty" json:"request_access_enabled,omitempty"`