Adjust validation for module name length

This matches the newly-unified v1alpha1 limits.

required does not seem to be necessary when min_len is present.

buf/registry/module/v1beta1/branch.proto

@@ -87,8 +87,10 @@ message BranchRef {
     ];
     // The name of the Module that contains this Branch.
     string module = 2 [
-      (buf.validate.field).required = true,
-      (buf.validate.field).string.max_len = 255
+      (buf.validate.field).string = {
+        min_len: 2,
+        max_len: 100
+      }
     ];
     // The name of the Branch.
     string branch = 3 [

buf/registry/module/v1beta1/module.proto

@@ -39,8 +39,10 @@ message Module {
   //
   // Unique within a given User or Organization.
   string name = 4 [
-    (buf.validate.field).required = true,
-    (buf.validate.field).string.max_len = 255
+    (buf.validate.field).string = {
+      min_len: 2,
+      max_len: 100
+    }
   ];
   // The id of the User or Organization that owns the Module.
   string owner_id = 5 [
@@ -108,8 +110,10 @@ message ModuleRef {
     ];
     // The name of the Module.
     string module = 2 [
-      (buf.validate.field).required = true,
-      (buf.validate.field).string.max_len = 255
+      (buf.validate.field).string = {
+        min_len: 2,
+        max_len: 100
+      }
     ];
   }
 

buf/registry/module/v1beta1/module_service.proto

@@ -94,8 +94,10 @@ message CreateModulesRequest {
     buf.registry.owner.v1beta1.OwnerRef owner_ref = 1 [(buf.validate.field).required = true];
     // The name of the Module.
     string name = 2 [
-      (buf.validate.field).required = true,
-      (buf.validate.field).string.max_len = 255
+      (buf.validate.field).string = {
+        min_len: 2,
+        max_len: 100
+      }
     ];
     // The module's visibility.
     ModuleVisibility visibility = 3 [

buf/registry/module/v1beta1/resource.proto

@@ -68,8 +68,10 @@ message ResourceRef {
     ];
     // The name of the Module the contains or is the resource.
     string module = 2 [
-      (buf.validate.field).required = true,
-      (buf.validate.field).string.max_len = 255
+      (buf.validate.field).string = {
+        min_len: 2,
+        max_len: 100
+      }
     ];
     oneof child {
       // The name of the Branch.

buf/registry/module/v1beta1/tag.proto

@@ -90,8 +90,10 @@ message TagRef {
     ];
     // The name of the Module that contains the Tag, either a User or Organization.
     string module = 2 [
-      (buf.validate.field).required = true,
-      (buf.validate.field).string.max_len = 255
+      (buf.validate.field).string = {
+        min_len: 2,
+        max_len: 100
+      }
     ];
     // The Tag name.
     string tag = 3 [

buf/registry/module/v1beta1/vcs_commit.proto

@@ -119,8 +119,10 @@ message VCSCommitRef {
     ];
     // The name of the Module that contains the VCSCommit.
     string module = 2 [
-      (buf.validate.field).required = true,
-      (buf.validate.field).string.max_len = 255
+      (buf.validate.field).string = {
+        min_len: 2,
+        max_len: 100
+      }
     ];
     // The hash of the VCSCommit.
     string hash = 3 [