Enforce Go style rules across codebase

Apply five style rules: convert iota string enums to typed
string constants, replace errors.As with errors.AsType,
merge three-group imports into two groups, fix multiline
parameter/argument formatting, and replace fmt.Sprintf URL
construction with net/url.

Signed-off-by: Émile Ré <emile@probo.com>

pkg/server/api/connect/v1/saml_resolvers.go

@@ -44,8 +44,7 @@ func (r *mutationResolver) CreateSAMLConfiguration(ctx context.Context, input ty
 		req,
 	)
 	if err != nil {
-		var errSAMLConfigurationEmailDomainAlreadyExists *iam.ErrSAMLConfigurationEmailDomainAlreadyExists
-		if errors.As(err, &errSAMLConfigurationEmailDomainAlreadyExists) {
+		if _, ok := errors.AsType[*iam.ErrSAMLConfigurationEmailDomainAlreadyExists](err); ok {
 			return nil, gqlutils.Conflict(ctx, err)
 		}