Move ui/issues tests to relevant subdirectories

* tests(ui): migrate issues/issue-17546 to ui/resolve
* tests(ui): add gh issue link
* tests(ui/issues): move tests to variants dir

tests/ui/variants/variant-result-noresult-used-as-type.rs

@@ -1,5 +1,6 @@
 //@ edition:2015
 //@ ignore-sgx std::os::fortanix_sgx::usercalls::raw::Result changes compiler suggestions
+// https://github.com/rust-lang/rust/issues/17546
 
 use foo::MyEnum::Result;
 use foo::NoResult; // Through a re-export

tests/ui/variants/variant-result-noresult-used-as-type.stderr

@@ -1,5 +1,5 @@
 error[E0573]: expected type, found variant `NoResult`
-  --> $DIR/issue-17546.rs:15:17
+  --> $DIR/variant-result-noresult-used-as-type.rs:16:17
    |
 LL |     fn new() -> NoResult<MyEnum, String> {
    |                 ^^^^^^^^^^^^^^^^^^^^^^^^
@@ -19,7 +19,7 @@ LL +     fn new() -> Result<MyEnum, String> {
    |
 
 error[E0573]: expected type, found variant `Result`
-  --> $DIR/issue-17546.rs:25:17
+  --> $DIR/variant-result-noresult-used-as-type.rs:26:17
    |
 LL |     fn new() -> Result<foo::MyEnum, String> {
    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^ not a type
@@ -36,7 +36,7 @@ LL +     use std::thread::Result;
    |
 
 error[E0573]: expected type, found variant `Result`
-  --> $DIR/issue-17546.rs:31:13
+  --> $DIR/variant-result-noresult-used-as-type.rs:32:13
    |
 LL | fn new() -> Result<foo::MyEnum, String> {
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^ not a type
@@ -53,7 +53,7 @@ LL + use std::thread::Result;
    |
 
 error[E0573]: expected type, found variant `NoResult`
-  --> $DIR/issue-17546.rs:36:15
+  --> $DIR/variant-result-noresult-used-as-type.rs:37:15
    |
 LL | fn newer() -> NoResult<foo::MyEnum, String> {
    |               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^