Drop tests of `$id` and `$anchor` against meta-schema `pattern`

[notEthan]

Per discussion at https://github.com/json-schema-org/JSON-Schema-Test-Suite/pull/716 These tests rely on the meta-schemas' pattern keywords for $id and $anchor, rather than anything particular to $id/$anchor keywords.

Relevant historical links:

• https://github.com/json-schema-org/JSON-Schema-Test-Suite/pull/567
• https://github.com/json-schema-org/JSON-Schema-Test-Suite/pull/341